Update & modernize Syncthing aport

[xentec]

Syncthing on Alpine has been stuck on version 0.14.5 for half a year now. In addition to a version update, I've added check(), but in disabled state as it unfortunately fails due to race in go depending glibc symbols (golang/go#14481).
From build log:

# runtime/race
race_linux_amd64.syso: In function `__sanitizer::InternalAlloc(unsigned long, __sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator32<0ul, 140737488355328ull, 0ul, __sanitizer::SizeClassMap<17ul, 64ul, 14ul>, 20ul, __sanitizer::TwoLevelByteMap<32768ull, 4096ull, __sanitizer::NoOpMapUnmapCallback>, __sanitizer::NoOpMapUnmapCallback> >*, unsigned long)':
gotsan.cc:(.text+0x1631): undefined reference to `__libc_malloc'
race_linux_amd64.syso: In function `__sanitizer::GetArgv()':
gotsan.cc:(.text+0x43c3): undefined reference to `__libc_stack_end'
race_linux_amd64.syso: In function `__sanitizer::InternalRealloc(void*, unsigned long, __sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator32<0ul, 140737488355328ull, 0ul, __sanitizer::SizeClassMap<17ul, 64ul, 14ul>, 20ul, __sanitizer::TwoLevelByteMap<32768ull, 4096ull, __sanitizer::NoOpMapUnmapCallback>, __sanitizer::NoOpMapUnmapCallback> >*)':
gotsan.cc:(.text+0x5580): undefined reference to `__libc_realloc'
race_linux_amd64.syso: In function `__sanitizer::ReExec()':
gotsan.cc:(.text+0x10337): undefined reference to `__libc_stack_end'
race_linux_amd64.syso: In function `__sanitizer::WriteOneLineToSyslog(char const*)':
gotsan.cc:(.text+0x4a97): undefined reference to `__syslog_chk'
race_linux_amd64.syso: In function `__sanitizer::InternalFree(void*, __sanitizer::SizeClassAllocatorLocalCache<__sanitizer::SizeClassAllocator32<0ul, 140737488355328ull, 0ul, __sanitizer::SizeClassMap<17ul, 64ul, 14ul>, 20ul, __sanitizer::TwoLevelByteMap<32768ull, 4096ull, __sanitizer::NoOpMapUnmapCallback>, __sanitizer::NoOpMapUnmapCallback> >*)':
gotsan.cc:(.text+0x55f8): undefined reference to `__libc_free'
collect2: error: ld returned 1 exit status

A patch for go/internals/race might be necessary to fix it.

Other than that I hope this PR will be accepted before Alpine 3.6.0. 😄

[shizmob]

Could you add a || true to the tests so they at least get ran (and !check is not needed), and a short comment explaining that the race test is expected to fail? The rest LGTM!

[algitbot]

Merged in e15e54d by @shizmob. Thanks for your contribution!

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