compiler: consistently use ifndef guards over pragma once

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Acked-by: Vedran Miletić <vedran@miletic.net>
Acked-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>

src/compiler/glsl_types.h

@@ -22,7 +22,6 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#pragma once
 #ifndef GLSL_TYPES_H
 #define GLSL_TYPES_H
 

src/compiler/nir_types.h

@@ -25,7 +25,8 @@
  *
  */
 
-#pragma once
+#ifndef NIR_TYPES_H
+#define NIR_TYPES_H
 
 #include <stdio.h>
 #include <stdbool.h>
@@ -157,3 +158,5 @@ const struct glsl_type *glsl_transposed_type(const struct glsl_type *type);
 #ifdef __cplusplus
 }
 #endif
+
+#endif /* NIR_TYPES_H */