avcodec: Add FF_CODEC_CAP_NOT_INIT_THREADSAFE

This is in preparation of switching the default init-thread-safety
to a codec being init-thread-safe.

Signed-off-by: Andreas Rheinhardt <[email protected]>
diff --git a/libavcodec/libwebpenc.c b/libavcodec/libwebpenc.c
index c5dc1b1..be7bfa3 100644
--- a/libavcodec/libwebpenc.c
+++ b/libavcodec/libwebpenc.c
@@ -96,6 +96,7 @@
     .p.pix_fmts     = ff_libwebpenc_pix_fmts,
     .p.priv_class   = &ff_libwebpenc_class,
     .p.wrapper_name = "libwebp",
+    .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
     .priv_data_size = sizeof(LibWebPContext),
     .defaults       = ff_libwebp_defaults,
     .init           = libwebp_encode_init,