RecursiveMutex: Prevent initialization-order-fiasco of mutex attribute

ASAN error:

==226990==ERROR: AddressSanitizer: initialization-order-fiasco on address 0x5a8f25b81ce0 at pc 0x5a8f17dd10ae bp 0x7ffe5391ce50 sp 0x7ffe5391ce48
READ of size 1 at 0x5a8f25b81ce0 thread T0
    #0 0x5a8f17dd10ad in XbmcThreads::CRecursiveMutex::getRecursiveAttr() xbmc/platform/posix/threads/RecursiveMutex.cpp:37:8
    #1 0x5a8f17817a4e in XbmcThreads::CRecursiveMutex::CRecursiveMutex() xbmc/platform/posix/threads/RecursiveMutex.h:35:60
    #2 0x5a8f17817998 in XbmcThreads::CountingLockable<XbmcThreads::CRecursiveMutex>::CountingLockable() xbmc/threads/Lockables.h:47:12
    #3 0x5a8f1780dae8 in CCriticalSection::CCriticalSection() xbmc/threads/CriticalSection.h:16:7
    #4 0x5a8f1b27fd98 in CComponentContainer<IApplicationComponent>::CComponentContainer() xbmc/utils/ComponentContainer.h:26:7
    #5 0x5a8f1b1f3273 in CApplication::CApplication() xbmc/application/Application.cpp:217:15
    #6 0x5a8f17918fe0 in xbmcutil::GlobalsSingleton<CApplication>::getInstance() xbmc/utils/GlobalsHandling.h:147:23
    #7 0x5a8f17918f0f in __cxx_global_var_init.1 xbmc/application/Application.h:250:1
    #8 0x5a8f17918f49 in _GLOBAL__sub_I_UPnPRenderer.cpp xbmc/network/upnp/UPnPRenderer.cpp
    #9 0x7c5016639dc3 in __libc_start_main (/usr/lib/libc.so.6+0x25dc3) (BuildId: 32a656aa5562eece8c59a585f5eacd6cf5e2307b)
    #10 0x5a8f17636814 in _start (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fa3814) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)

0x5a8f25b81ce0 is located 32 bytes before global variable 'XbmcThreads::recursiveAttr' defined in 'xbmc/platform/posix/threads/RecursiveMutex.cpp' (0x5a8f25b81d00) of size 4
  registered at:
    #0 0x5a8f17651629 in __asan_register_globals.part.0 (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fbe629) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)
    #1 0x5a8f17651cce in __asan_register_elf_globals (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fbecce) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)
    #2 0x7c5016639dc3 in __libc_start_main (/usr/lib/libc.so.6+0x25dc3) (BuildId: 32a656aa5562eece8c59a585f5eacd6cf5e2307b)
    #3 0x5a8f17636814 in _start (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fa3814) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)

0x5a8f25b81ce0 is located 0 bytes inside of global variable 'XbmcThreads::recursiveAttrSet' defined in 'xbmc/platform/posix/threads/RecursiveMutex.cpp' (0x5a8f25b81ce0) of size 1
  'XbmcThreads::recursiveAttrSet' is ascii string ''
  registered at:
    #0 0x5a8f17651629 in __asan_register_globals.part.0 (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fbe629) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)
    #1 0x5a8f17651cce in __asan_register_elf_globals (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fbecce) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)
    #2 0x7c5016639dc3 in __libc_start_main (/usr/lib/libc.so.6+0x25dc3) (BuildId: 32a656aa5562eece8c59a585f5eacd6cf5e2307b)
    #3 0x5a8f17636814 in _start (/home/mark/Coding/Repos/kodi-git/build_clang_debug_sanitizer/kodi.bin+0x9fa3814) (BuildId: 6cfd7dacce8a4a587ad47d2f082a4e50dad4c176)

SUMMARY: AddressSanitizer: initialization-order-fiasco xbmc/platform/posix/threads/RecursiveMutex.cpp:37:8 in XbmcThreads::CRecursiveMutex::getRecursiveAttr()
Shadow bytes around the buggy address:
  0x5a8f25b81a00: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 00 00 00 00
  0x5a8f25b81a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x5a8f25b81b00: 00 00 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 00 00 00 00
  0x5a8f25b81b80: f6 f6 f6 f6 00 00 00 00 f6 f6 f6 f6 f6 f6 f6 f6
  0x5a8f25b81c00: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6
=>0x5a8f25b81c80: 00 00 00 00 f6 f6 f6 f6 00 00 00 00[f6]f6 f6 f6
  0x5a8f25b81d00: 04 f9 f9 f9 01 f9 f9 f9 00 00 00 00 f6 f6 f6 f6
  0x5a8f25b81d80: 00 00 00 00 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6
  0x5a8f25b81e00: 00 00 00 00 f6 f6 f6 f6 00 00 00 00 f9 f9 f9 f9
  0x5a8f25b81e80: 00 f9 f9 f9 00 f9 f9 f9 f6 f6 f6 f6 f6 f6 f6 f6
  0x5a8f25b81f00: f6 f6 f6 f6 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb

xbmc/platform/posix/threads/RecursiveMutex.cpp

@@ -11,31 +11,18 @@
 namespace XbmcThreads
 {
 
-static pthread_mutexattr_t recursiveAttr;
-
-static bool SetRecursiveAttr()
+pthread_mutexattr_t& CRecursiveMutex::getRecursiveAttr()
 {
-  static bool alreadyCalled = false;
-
-  if (!alreadyCalled)
+  static pthread_mutexattr_t recursiveAttr = []()
   {
+    pthread_mutexattr_t recursiveAttr;
     pthread_mutexattr_init(&recursiveAttr);
     pthread_mutexattr_settype(&recursiveAttr, PTHREAD_MUTEX_RECURSIVE);
 #if !defined(TARGET_ANDROID)
     pthread_mutexattr_setprotocol(&recursiveAttr, PTHREAD_PRIO_INHERIT);
 #endif
-    alreadyCalled = true;
-  }
-
-  return true; // note, we never call destroy.
-}
-
-static bool recursiveAttrSet = SetRecursiveAttr();
-
-pthread_mutexattr_t& CRecursiveMutex::getRecursiveAttr()
-{
-  if (!recursiveAttrSet) // this is only possible in the single threaded startup code
-    recursiveAttrSet = SetRecursiveAttr();
+    return recursiveAttr;
+  }();
 
   return recursiveAttr;
 }