warning/portability fixes.

source/blender/blenkernel/BKE_brush.h

@@ -36,7 +36,7 @@ struct Brush;
 struct ImBuf;
 struct Scene;
 struct wmOperator;
-enum CurveMappingPreset;
+// enum CurveMappingPreset;
 
 /* datablock functions */
 struct Brush *add_brush(const char *name);

source/blender/blenkernel/BKE_utildefines.h

@@ -279,8 +279,11 @@ behaviour, though it may not be the best in practice.
 /*little macro so inline keyword works*/
 #if defined(_MSC_VER)
 #define BM_INLINE static __forceinline
-#else
+#elif defined(__GNUC__)
 #define BM_INLINE static inline __attribute((always_inline))
+#else
+#warning "MSC/GNUC defines not found, inline non-functional"
+#define BM_INLINE static 
 #endif
 
 #define BMEMSET(mem, val, size) {unsigned int _i; char *_c = (char*) mem; for (_i=0; _i<size; _i++) *_c++ = val;}