Support Xcode7/iOS9

[hufkens]

I know that development has stopped, but it would be nice if we could keep our old apps running on the new iOS versions as long as possible. I converted the apps to 64bit, but now I get an error when I start the app with Xcode7/iOS9.

2015-09-22 09:22:49.353 WeeSubs[713:314073] cocos2d: ERROR: Failed to compile shader:
precision mediump float;
uniform mat4 CC_PMatrix;
uniform mat4 CC_MVMatrix;
uniform mat4 CC_MVPMatrix;
uniform vec4 CC_Time;
uniform vec4 CC_SinTime;
uniform vec4 CC_CosTime;
uniform vec4 CC_Random01;
//CC INCLUDES END


#extension GL_OES_standard_derivatives : enable                                                                             

#ifdef GL_ES                                                                                                                
varying mediump vec4 v_color;                                                                                               
varying mediump vec2 v_texcoord;                                                                                            
#else                                                                                                                       
varying vec4 v_color;                                                                                                       
varying vec2 v_texcoord;                                                                                                    
#endif                                                                                                                      

void main()                                                                                                                 
{                                                                                                                           
#if defined GL_OES_standard_derivatives                                                                                     
    gl_FragColor = v_color*smoothstep(0.0, length(fwidth(v_texcoord)), 1.0 - length(v_texcoord));                           
#else                                                                                                                       
    gl_FragColor = v_color*step(0.0, 1.0 - length(v_texcoord));                                                             
#endif                                                                                                                      
}                                                                                                                           
2015-09-22 09:22:49.353 WeeSubs[713:314073] cocos2d: ERROR: 0:12: '' : syntax error: #extension must always be before any non-preprocessor tokens

I looked it up an stumbled into this post: http://forum.cocos2d-objc.org/t/xcode-7-ios9-beta/17346 Which is for the latest version.

And there appears to be a pull request fixing my issue: #7

Thanks for considering it