fix: linker errors when jpeg and png are not supported

Author: lc-soft

src/image/reader.c

@@ -45,9 +45,13 @@ typedef struct LCUI_ImageInterfaceRec_ {
 } LCUI_ImageInterfaceRec, *LCUI_ImageInterface;
 
 static const LCUI_ImageInterfaceRec interfaces[] = {
+#ifdef USE_LIBPNG
 	{ ".png", LCUI_InitPNGReader, LCUI_ReadPNGHeader, LCUI_ReadPNG },
+#endif
+#ifdef USE_LIBJPEG
 	{ ".jpeg .jpg", LCUI_InitJPEGReader, LCUI_ReadJPEGHeader,
 	  LCUI_ReadJPEG },
+#endif
 	{ ".bmp", LCUI_InitBMPReader, LCUI_ReadBMPHeader, LCUI_ReadBMP }
 };