Replace compile-warnings for unsupported image formats in writers with a log message warning.

Having too many warnings makes it harder to see real warnings.
I know the idea to keep those around was to have them as reminder to work on those.
But going over the formats here - it just doesn't make sense in most cases.
And for the rest (like we could add converts from R8 or so) no-one is going to work on it until someone concretely needs it anyway. 


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6046 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CImageWriterJPG.cpp

@@ -10,6 +10,7 @@
 #include "IWriteFile.h"
 #include "CImage.h"
 #include "irrString.h"
+#include "os.h"
 
 #ifdef _IRR_COMPILE_WITH_LIBJPEG_
 #include <stdio.h> // required for jpeglib.h
@@ -121,10 +122,9 @@ static bool writeJPEGFile(io::IWriteFile* file, IImage* image, u32 quality)
 		case ECF_R5G6B5:
 			format = CColorConverter::convert_R5G6B5toR8G8B8;
 			break;
-#ifndef _DEBUG
 		default:
+			os::Printer::log("writeJPEGFile does not support image format", ColorFormatNames[image->getColorFormat()], ELL_WARNING);
 			break;
-#endif
 	}
 
 	// couldn't find a color converter