CMake: Removed temporarily disabled clang block

Was disabled in rBc778fd981e63. Libraries have been updated in rBL62576.

build_files/cmake/platform/platform_apple.cmake

@@ -333,13 +333,12 @@ if(WITH_LLVM)
   if(NOT LLVM_FOUND)
     message(FATAL_ERROR "LLVM not found.")
   endif()
-# Temporarily removing clang - new libs still need to be committed
-#  if(WITH_CLANG)
-#    find_package(Clang)
-#    if(NOT CLANG_FOUND)
-#       message(FATAL_ERROR "Clang not found.")
-#    endif()
-#  endif()
+  if(WITH_CLANG)
+    find_package(Clang)
+    if(NOT CLANG_FOUND)
+       message(FATAL_ERROR "Clang not found.")
+    endif()
+  endif()
 
 endif()