multimedia/svt-av1: unbreak ffmpeg < 5.1 encoding after 7d7c819

$ ffmpeg -hide_banner -i foo.y4m -c:v libsvtav1 -y foo.mp4
[...]
Segmentation fault
(lldb) bt
* thread #1, name = 'ffmpeg', stop reason = signal SIGSEGV: invalid address (fault address: 0x438)
  * frame #0: 0x00000008372f34b9 libSvtAv1Enc.so.1`svt_aom_copy_metadata_buffer(dst=0x000000089e044680, src=0x0000000000000438) at EbMetadataHandle.c:108:26
    frame #1: 0x00000008372e67c4 libSvtAv1Enc.so.1`copy_input_buffer(scs=0x0000000868186380, dst=0x000000089e044680, dst_y8b=0x000000089e047380, src=0x0000000820287b20, pass=0) at EbEncHandle.c:4820:13
    frame #2: 0x00000008372e64d4 libSvtAv1Enc.so.1`svt_av1_enc_send_picture(svt_enc_component=0x000000085f30de60, p_buffer=0x0000000820287b20) at EbEncHandle.c:4865:9
    frame #3: 0x000000082449de42 libavcodec.so.58`eb_receive_packet at libsvtav1.c:433:9
    frame #4: 0x000000082449dc7a libavcodec.so.58`eb_receive_packet(avctx=0x000000085f309300, pkt=0x000000085f312c00) at libsvtav1.c:503
    frame #5: 0x000000082419f960 libavcodec.so.58`encode_receive_packet_internal(avctx=0x000000085f309300, avpkt=0x000000085f312c00) at encode.c:301:15
    frame #6: 0x000000082419f893 libavcodec.so.58`avcodec_send_frame(avctx=0x000000085f309300, frame=0x0000000000000000) at encode.c:387:15
    frame #7: 0x0000000000231e9a ffmpeg`transcode at ffmpeg.c:1995:23
    frame #8: 0x0000000000231ce8 ffmpeg`transcode at ffmpeg.c:4825
    frame #9: 0x000000000022da03 ffmpeg`main(argc=<unavailable>, argv=<unavailable>) at ffmpeg.c:5010:9
    frame #10: 0x0000000000215ad0 ffmpeg`_start(ap=<unavailable>, cleanup=<unavailable>) at crt1_c.c:75:7

Regressed by:	https://gitlab.com/AOMediaCodec/SVT-AV1/-/commit/921c1877c050
See also:	https://git.ffmpeg.org/gitweb/ffmpeg.git/commitdiff/4243da4ff42e

multimedia/svt-av1/Makefile

@@ -1,8 +1,12 @@
 PORTNAME=	svt-av1
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.2.0
+PORTREVISION=	1
 CATEGORIES=	multimedia
 
+PATCH_SITES=	${GL_SITE}/${GL_ACCOUNT}/${GL_PROJECT}/-/commit/
+PATCHFILES+=	213854249dc8.patch:-p1 # https://gitlab.com/AOMediaCodec/SVT-AV1/-/merge_requests/1991
+
 MAINTAINER=	jbeich@FreeBSD.org
 COMMENT=	Scalable AV1 encoder
 

multimedia/svt-av1/distinfo

@@ -1,3 +1,5 @@
 TIMESTAMP = 1659585744
 SHA256 (AOMediaCodec-SVT-AV1-14c38dca41e352a89643c4a89bc5417b7e5c1ae8_GL0.tar.gz) = 4b0528d186b51b1be67cada02e661598395204974386b9861ba3ff2fef8fd667
 SIZE (AOMediaCodec-SVT-AV1-14c38dca41e352a89643c4a89bc5417b7e5c1ae8_GL0.tar.gz) = 10197958
+SHA256 (213854249dc8.patch) = f036abffa084399732ff16d603b6fe386aa22bebfae70c9cba78b689d1cf62df
+SIZE (213854249dc8.patch) = 1552