Adding explanations for -ext in ccConfig

Author: oxeron

cocos2d/ccConfig.h

@@ -166,6 +166,10 @@
 #define CC_SHADER_DEFAULT_FRAGMENT_PRECISION mediump
 #endif
 
+/**
+ If you disable one of this -ext you must remove corresponding files from your Xcode project 
+ or your may get errors when building project
+ */
 #ifndef CC_LIGHTING
 #define CC_LIGHTING 0
 #endif
@@ -178,6 +182,9 @@
 #define CC_CCBREADER 0
 #endif
 
+/**
+ For CCEffectLighting you need to enable both CC_EFFECTS and CC_LIGHTING
+ */
 #ifndef CC_EFFECTS
 #define CC_EFFECTS 0
 #endif