Fix compile error for 32-bit CRITICAL_SECTION size embedded in mutex (#415)

include/llvm/Support/Mutex.h

@@ -74,7 +74,7 @@ namespace llvm
 #if 0 // HLSL Change
       void* data_; ///< We don't know what the data will be
 #else
-      char data_[40]; // C_ASSERT this is CRITICAL_SECTION-sized
+      char data_[sizeof(void*) == 8 ? 40 : 24]; // C_ASSERT this is CRITICAL_SECTION-sized
 #endif // HLSL Change
 #endif
 

utils/hct/hcthelp.cmd

@@ -13,5 +13,7 @@ echo   hcttodo      - enumerates TODO comments
 echo   hcttools     - changes the directory to console tools
 echo   hctvs        - launches Visual Studio with the built solution
 echo.
-echo Set the HCT_EXTRAS environment variable to allow scripts to be hooked in.
+echo Environment variables overrides
+echo   BUILD_ARCH - default build architecture, one of Win32, x64, arm, currently '%BUILD_ARCH%'
+echo   HCT_EXTRAS - allows scripts to be hooked in, currently '%HCT_EXTRAS%'
 echo.