glsl: Include main/core.h.

Make glsl include only main/core.h from core mesa.

src/glsl/program.h

@@ -21,13 +21,7 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <GL/gl.h>
-#include "main/mtypes.h"
-
-extern "C" {
-#include "program/prog_parameter.h"
-#include "program/prog_uniform.h"
-}
+#include "main/core.h"
 
 extern void
 link_shaders(GLcontext *ctx, struct gl_shader_program *prog);