ci: remove leftover libplacebo subproject options

486bb93dfa removed the wrap which made
these specific options obsolete.

ci/build-freebsd.sh

@@ -7,7 +7,6 @@ export LDFLAGS="$LDFLAGS -L/usr/local/lib"
 
 meson setup build \
     --werror      \
-    -Dlibplacebo:werror=false \
     -Dc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations" \
     -Diconv=disabled \
     -Dlibmpv=true \

ci/build-mingw64.sh

@@ -269,7 +269,6 @@ rm -rf $build
 
 meson setup $build --cross-file "$prefix_dir/crossfile" \
     --werror                   \
-    -Dlibplacebo:werror=false  \
     -Dc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations" \
     --buildtype debugoptimized \
     -Dlibmpv=true -Dlua=luajit \

ci/build-tumbleweed.sh

@@ -3,7 +3,6 @@ set -e
 
 meson setup build \
   --werror        \
-  -Dlibplacebo:werror=false \
   -Dc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations" \
   -Db_sanitize=address,undefined \
   -Dcdda=enabled          \