[FFmpeg] remove libXfixes (#5863)

Fixes build (which apparently failed due to incompatibility of unneeded distro
packages being mixed with unneeded git packages)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
diff --git a/projects/ffmpeg/Dockerfile b/projects/ffmpeg/Dockerfile
index bb0bb58..ab25e33 100644
--- a/projects/ffmpeg/Dockerfile
+++ b/projects/ffmpeg/Dockerfile
@@ -28,7 +28,6 @@
 RUN wget https://www.alsa-project.org/files/pub/lib/alsa-lib-1.1.0.tar.bz2
 RUN git clone --depth 1 https://github.com/mstorsjo/fdk-aac.git
 RUN git clone --depth 1 git://anongit.freedesktop.org/xorg/lib/libXext
-RUN git clone --depth 1 git://anongit.freedesktop.org/git/xorg/lib/libXfixes
 RUN git clone --depth 1 https://github.com/intel/libva
 RUN git clone --depth 1 -b libvdpau-1.2 git://people.freedesktop.org/~aplattner/libvdpau
 RUN git clone --depth 1 https://chromium.googlesource.com/webm/libvpx
diff --git a/projects/ffmpeg/build.sh b/projects/ffmpeg/build.sh
index b3bc5a5..b2b0033 100755
--- a/projects/ffmpeg/build.sh
+++ b/projects/ffmpeg/build.sh
@@ -50,13 +50,6 @@
 make -j$(nproc)
 make install
 
-cd $SRC/libXfixes
-./autogen.sh
-./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static
-make clean
-make -j$(nproc)
-make install
-
 cd $SRC/libva
 ./autogen.sh
 ./configure --prefix="$FFMPEG_DEPS_PATH" --enable-static --disable-shared