Fix a preprocessor defect, where nested dead #if-#endif had nesting depth off by one level, turning what should be dead code into live code.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20461 e7fa87d3-cd2b-0410-9028-fcbf551c1848