appveyor: remove broken packages, install libplacebo

Support for Ada and Objective-C was removed from MSYS2, which made
pacman refuse to update GCC while the gcc-ada and gcc-objc packages were
installed. Remove those packages before updating the others. Also remove
ANGLE, which has been removed from MSYS2, and add libplacebo, which is
now needed for the Vulkan VO.

TOOLS/appveyor-build.sh

@@ -10,11 +10,9 @@ export PYTHON=/usr/bin/python3
 "$PYTHON" bootstrap.py
 "$PYTHON" waf configure \
     --check-c-compiler=gcc \
-    --disable-egl-angle-lib \
     --enable-spirv-cross \
     --enable-d3d-hwaccel \
     --enable-d3d11 \
-    --enable-egl-angle \
     --enable-jpeg \
     --enable-lcms2 \
     --enable-libarchive \

TOOLS/appveyor-install.sh

@@ -14,12 +14,12 @@ EOF
 # Install build dependencies for mpv
 pacman -S --noconfirm --needed \
     $MINGW_PACKAGE_PREFIX-toolchain \
-    $MINGW_PACKAGE_PREFIX-angleproject-git \
     $MINGW_PACKAGE_PREFIX-cmake \
     $MINGW_PACKAGE_PREFIX-lcms2 \
     $MINGW_PACKAGE_PREFIX-libarchive \
     $MINGW_PACKAGE_PREFIX-libass \
     $MINGW_PACKAGE_PREFIX-libjpeg-turbo \
+    $MINGW_PACKAGE_PREFIX-libplacebo \
     $MINGW_PACKAGE_PREFIX-lua51 \
     $MINGW_PACKAGE_PREFIX-ninja \
     $MINGW_PACKAGE_PREFIX-rubberband \

appveyor.yml

@@ -15,6 +15,12 @@ shallow_clone: true
 test: off
 
 install:
+  # Support for Ada and Objective-C was removed from MSYS2. GCC won't update if
+  # these packages are installed.
+  - >-
+    C:\msys64\usr\bin\pacman -R --noconfirm --noprogressbar
+    mingw-w64-i686-gcc-ada mingw-w64-i686-gcc-objc mingw-w64-x86_64-gcc-ada
+    mingw-w64-x86_64-gcc-objc
   # Update core packages
   - C:\msys64\usr\bin\pacman -Syyuu --noconfirm --noprogressbar --ask=20
   # Update non-core packages