Add the GL_ES macro for ES personalities, along with a general mechanism for adding preambles in front of shaders without effecting line numbers, etc.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@21122 e7fa87d3-cd2b-0410-9028-fcbf551c1848

StandAlone/StandAlone.cpp

@@ -89,7 +89,7 @@ int OutputMultipleStrings = 1;
 // Set up the per compile resources
 //
 void GenerateResources(TBuiltInResource& resources)
-{    
+{
     resources.maxLights = 32;
     resources.maxClipPlanes = 6;
     resources.maxTextureUnits = 32;