Align Checked C lit configuration scripts with clang's scripts again. (…

…#16)

Cherry-picked from commit 2ca19552da07bd697aa84cea8289cbe3e5bb1462

    We have a separate test directory  for Checked C language feature tests.  These need their own lit configuration scripts. We've cloned the clang lit configuration scripts and altered them slightly for this purpose. The Checked C scripts have diverged from the clang ones because we haven't been tracking changes to the clang scripts.  This brings the scripts back into alignment.

llvm/projects/checkedc-wrapper/CMakeLists.txt

@@ -23,8 +23,8 @@ if(CHECKEDC_IN_TREE)
   string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} CLANG_TOOLS_DIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
 
   configure_lit_site_cfg(
-    ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
-    ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
+    ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in
+    ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py
     )
 
   list(APPEND CHECKEDC_TEST_DEPS
@@ -38,7 +38,7 @@ if(CHECKEDC_IN_TREE)
   endif()
 
   set(CHECKEDC_TEST_PARAMS
-    checkedc_site_config=${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg
+    checkedc_site_config=${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py
     )
 
 if( NOT CLANG_BUILT_STANDALONE )