Begin added vertex shader state/support.

Renamed pipe_fs_state to pipe_shader_state since it can be used for both
vertex and fragment shader info.

src/mesa/state_tracker/st_program.h

@@ -83,7 +83,9 @@ struct st_vertex_program
 				 * ProgramStringNotify changes.
 				 */
 
+   struct tgsi_token tokens[ST_FP_MAX_TOKENS];
    GLboolean dirty;
+   struct pipe_constant_buffer constants;
    GLuint param_state;
 };