assembler: Don't pollute the library files with gen4asm.h

gen4asm.h is assembler specific while we want the library files to be
somewhat of a proper library.

This means that we have to redefine the GL* typedefs for brw_structs.h,
not using any of thet GL typedef will be for a future commit.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

assembler/brw_structs.h

@@ -33,6 +33,14 @@
 #ifndef BRW_STRUCTS_H
 #define BRW_STRUCTS_H
 
+#include <stdint.h>
+
+typedef unsigned char GLubyte;
+typedef short GLshort;
+typedef unsigned int GLuint;
+typedef int GLint;
+typedef float GLfloat;
+
 /* These seem to be passed around as function args, so it works out
  * better to keep them as #defines:
  */