cogl: Switch remaining headers to pragma once

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3910>

cogl/cogl/cogl-cpu-caps.h

@@ -28,8 +28,7 @@
  *
  */
 
-#ifndef COGL_CPU_CAPS_H
-#define COGL_CPU_CAPS_H
+#pragma once
 
 #include "cogl/cogl-types.h"
 
@@ -50,5 +49,3 @@ cogl_cpu_has_cap (CoglCpuCaps cap)
 {
   return !!(cogl_cpu_caps & cap);
 }
-
-#endif /* COGL_CPU_CAPS_H */

cogl/cogl/cogl-half-float.h

@@ -23,8 +23,7 @@
 
 /* This source file is originally from Mesa (src/util/half_float.h). */
 
-#ifndef COGL_HALF_FLOAT_H
-#define COGL_HALF_FLOAT_H
+#pragma once
 
 #include "cogl/cogl-types.h"
 
@@ -117,5 +116,3 @@ cogl_half_is_negative (uint16_t h)
 {
    return !!(h & 0x8000);
 }
-
-#endif /* COGL_HALF_FLOAT_H */

cogl/cogl/cogl-soft-float.h

@@ -40,8 +40,7 @@
  * from the Berkeley SoftFloat 3e Library.
  */
 
-#ifndef COGL_SOFT_FLOAT_H
-#define COGL_SOFT_FLOAT_H
+ #pragma once
 
 #include <glib.h>
 #include <stdint.h>
@@ -67,5 +66,3 @@ float cogl_double_to_f32 (double   x,
                           gboolean rtz);
 
 uint16_t cogl_float_to_half_rtz_slow (float x);
-
-#endif  /* COGL_SOFT_FLOAT_H */