Reduce rawimage.h dependencies

rtengine/rawimage.h

@@ -16,8 +16,7 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
  */
-#ifndef __RAWIMAGE_H
-#define __RAWIMAGE_H
+#pragma once
 
 #include <ctime>
 #include <cmath>
@@ -307,5 +306,3 @@ public:
 };
 
 }
-
-#endif // __RAWIMAGE_H