fourcc: add WebP image format

Refs #19446

include/vlc_fourcc.h

@@ -406,6 +406,7 @@
 #define VLC_CODEC_PCX             VLC_FOURCC('p','c','x',' ')
 #define VLC_CODEC_XWD             VLC_FOURCC('X','W','D',' ')
 #define VLC_CODEC_TXD             VLC_FOURCC('T','X','D',' ')
+#define VLC_CODEC_WEBP            VLC_FOURCC('W','E','B','P')
 
 
 /* Audio codec */

src/misc/fourcc_list.h

@@ -1003,6 +1003,9 @@ static const staticentry_t p_list_video[] = {
         A("LJ2C"),
         A("LJ2K"),
 
+    B(VLC_CODEC_WEBP, "WebP Image"),
+        A("WEBP"),
+
     B(VLC_CODEC_LAGARITH, "Lagarith Lossless"),
         A("LAGS"),