media-video/ffmpeg: fix building without SSSE3

Closes: https://bugs.gentoo.org/728566
Package-Manager: Portage-2.3.101, Repoman-2.3.22
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

media-video/ffmpeg/ffmpeg-4.3.ebuild

@@ -325,6 +325,7 @@ S=${WORKDIR}/${P/_/-}
 
 PATCHES=(
 	"${FILESDIR}"/chromium-r1.patch
+	"${FILESDIR}"/${PN}-4.3-fix-build-without-SSSE3.patch
 )
 
 MULTILIB_WRAPPED_HEADERS=(

media-video/ffmpeg/files/ffmpeg-4.3-fix-build-without-SSSE3.patch

@@ -0,0 +1,22 @@
+https://bugs.gentoo.org/728566
+http://ffmpeg.org/pipermail/ffmpeg-devel/2020-February/257474.html
+
+--- a/libswscale/x86/yuv2rgb.c
++++ b/libswscale/x86/yuv2rgb.c
+@@ -83,6 +83,7 @@ av_cold SwsFunc ff_yuv2rgb_init_x86(SwsContext *c)
+ #if HAVE_X86ASM
+     int cpu_flags = av_get_cpu_flags();
+ 
++#if HAVE_SSSE3
+     if (EXTERNAL_SSSE3(cpu_flags)) {
+         switch (c->dstFormat) {
+         case AV_PIX_FMT_RGB32:
+@@ -111,6 +112,7 @@ av_cold SwsFunc ff_yuv2rgb_init_x86(SwsContext *c)
+             return yuv420_rgb15_ssse3;
+         }
+     }
++#endif
+ 
+     if (EXTERNAL_MMXEXT(cpu_flags)) {
+         switch (c->dstFormat) {
+