Fixed: CMake definitions in PCH

--HG--
branch : develop

code/CMakeModules/PCHSupport.cmake

@@ -28,8 +28,6 @@ ELSE()
 ENDIF()
 
 MACRO(APPEND_DEFINITION _NAME _VAL)
-  # value is not empty
-  IF(${_VAL})
   IF(CMAKE_VERSION VERSION_LESS "2.8.12")
     # don't support logical expressions, append definition
     LIST(APPEND ${_NAME} "-D${_VAL}")
@@ -37,7 +35,6 @@ MACRO(APPEND_DEFINITION _NAME _VAL)
     # support logical expressions, use them
     LIST(APPEND ${_NAME} "$<$<BOOL:${_VAL}>:-D$<JOIN:${_VAL},-D>>")
   ENDIF()
-  ENDIF()
 ENDMACRO()
 
 # Set PCH_FLAGS for common flags, PCH_ARCH_XXX_FLAGS for specific archs flags and PCH_ARCHS for archs