Tessellation partial implementation (not ready for use yet), including:

- the built-in constants
 - built-in variable declarations, some dependent on gl_MaxPatchVertices
 - layout qualifier for vertices (shared with geometry shader max_vertices)
 - layout qualifiers for vertex spacing, vertex order, point mode, and primitive type
 - link semantics for layout qualifiers

Still TBD:
 - patch qualifier and arrayed input handling
 - sizing of gl_out[]
 - additional semantic checking
 - supporting the extension on version 150

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24468 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/Versions.h

@@ -85,6 +85,7 @@ const char* const GL_ARB_shading_language_420pack = "GL_ARB_shading_language_420
 const char* const GL_ARB_texture_gather           = "GL_ARB_texture_gather";
 const char* const GL_ARB_gpu_shader5              = "GL_ARB_gpu_shader5";
 const char* const GL_ARB_separate_shader_objects  = "GL_ARB_separate_shader_objects";
+const char* const GL_ARB_tessellation_shader      = "GL_ARB_tessellation_shader";       // TODO: tessellation: make this extension work on version 150 and above shaders
 
 } // end namespace glslang