Fix order of header files for gcc 4.7 (see issue 1575 and issue 1701)

rtengine/LUT.h

@@ -68,6 +68,7 @@
 
 #include <cstring>
 #ifndef NDEBUG
+#include <glibmm.h>
 #include <fstream>
 #endif
 

rtengine/color.cc

@@ -17,7 +17,7 @@
 *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "rt_math.h"
+#include "rtengine.h"
 #include "color.h"
 #include "iccmatrices.h"
 #include "mytime.h"

rtengine/rt_math.h

@@ -3,7 +3,6 @@
 #include <cmath>
 #include <algorithm>
 
-#include "rtengine.h"
 
 namespace rtengine {
 	static const int MAXVAL = 0xffff;