IVGCVSW-5104 Fix OS-X GetCurrentThreadId build error

Change-Id: Ic54b8d387d8507209e8777d25dcd2c4bc1641bf4
Signed-off-by: Jim Flynn <jim.flynn@arm.com>
diff --git a/cmake/GlobalConfig.cmake b/cmake/GlobalConfig.cmake
index 60b6a3d..142e536 100644
--- a/cmake/GlobalConfig.cmake
+++ b/cmake/GlobalConfig.cmake
@@ -37,7 +37,9 @@
 include(SelectLibraryConfigurations)
 
 set(COMPILER_IS_GNU_LIKE 0)
-if(${CMAKE_CXX_COMPILER_ID} STREQUAL GNU OR ${CMAKE_CXX_COMPILER_ID} STREQUAL Clang)
+if(${CMAKE_CXX_COMPILER_ID} STREQUAL GNU OR
+   ${CMAKE_CXX_COMPILER_ID} STREQUAL Clang OR
+   ${CMAKE_CXX_COMPILER_ID} STREQUAL AppleClang)
     set(COMPILER_IS_GNU_LIKE 1)
 endif()