Wrong comment creation for GL_ARB_shading_language_include

When the include processor finds the line

#extension GL_ARB_shading_language_include : require

it's replaced with
/*GL_ARB_shading_language_include*/ : require

instead of (for example)
/*#extension GL_ARB_shading_language_include : require*/

causing the shader compiler to find an unexpected ":" and thus fail to compile the shader