Release cube map surfaces on successful conversion (avoiding a memory leak).

src/common/version.h

 #define MAJOR_VERSION 0
 #define MINOR_VERSION 0
 #define BUILD_VERSION 0
-#define BUILD_REVISION 719
+#define BUILD_REVISION 720
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/libGLESv2/Texture.cpp

@@ -2255,6 +2255,9 @@ void TextureCubeMap::convertToRenderTarget()
 
                         return error(GL_OUT_OF_MEMORY);
                     }
+
+                    source->Release();
+                    dest->Release();
                 }
             }
         }