GIT_SILENT: fix option

CMakeLists.txt

@@ -167,10 +167,10 @@ endif()
 
 
 option(USE_PRECOMPILED_HEADERS "Use precompiled headers" OFF) # Set to OFF when using clazy and such
-set(COMPILE_WITH_CMAKE_PCH_SUPPORT false)
+set(COMPILE_WITH_CMAKE_PCH_SUPPORT OFF)
 macro(pim_target_precompile_headers)
     if (USE_PRECOMPILED_HEADERS)
-            set(COMPILE_WITH_CMAKE_PCH_SUPPORT true)
+	    set(COMPILE_WITH_CMAKE_PCH_SUPPORT ON)
 
         if (COMPILE_WITH_CMAKE_PCH_SUPPORT)
             target_precompile_headers(${ARGV})