Fix the few non-portable uses of "char" (where a -1 might be relevant): All uses...

Fix the few non-portable uses of "char" (where a -1 might be relevant): All uses of char are now either "int", "unsigned char" or char arrays for storing strings.  Also, went to consistent "char* foo" coding convention.  (There were only a few ambiguous uses.)

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@25400 e7fa87d3-cd2b-0410-9028-fcbf551c1848