chore(CI): Add support for building VPX for macOS

Manually set library id name because it defaults to "libvpx.7.dylib",
for some reason, which is not found by qTox or tests.

buildscripts/build_vpx.sh

@@ -10,27 +10,41 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 
 source "${SCRIPT_DIR}/build_utils.sh"
 
-parse_arch --dep "vpx" --supported "win32 win64" "$@"
+parse_arch --dep "vpx" --supported "win32 win64 macos" "$@"
 
 if [[ "$SCRIPT_ARCH" == "win64" ]]; then
 # There is a bug in gcc that breaks avx512 on 64-bit Windows https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54412
 # VPX fails to build due to it.
 # This is a workaround as suggested in https://stackoverflow.com/questions/43152633
     ARCH_FLAGS="-fno-asynchronous-unwind-tables"
-    VPX_ARCH="x86_64-win64-gcc"
+    CROSS_ARG="${MINGW_ARCH}-w64-mingw32-"
+    TARGET_ARG="--target=x86_64-win64-gcc"
 elif [[ "$SCRIPT_ARCH" == "win32" ]]; then
     ARCH_FLAGS=""
-    VPX_ARCH="x86-win32-gcc"
+    CROSS_ARG="${MINGW_ARCH}-w64-mingw32-"
+    TARGET_ARG="--target=x86-win32-gcc"
+elif [ "${SCRIPT_ARCH}" == "macos" ]; then \
+    ARCH_FLAGS=""
+    CROSS_ARG=""
+    TARGET_ARG=""
 else
     exit 1
 fi
 
 "${SCRIPT_DIR}/download/download_vpx.sh"
 
-patch -Np1 < "${SCRIPT_DIR}/patches/vpx-windows.patch"
+if [ "${SCRIPT_ARCH}" == "macos" ]; then
+    patch -Np1 < "${SCRIPT_DIR}/patches/vpx-macos.patch"
+else
+    patch -Np1 < "${SCRIPT_DIR}/patches/vpx-windows.patch"
+fi
 
-CFLAGS=${ARCH_FLAGS} CROSS="${MINGW_ARCH}-w64-mingw32-" \
-    ./configure --target="${VPX_ARCH}" \
+CFLAGS="${ARCH_FLAGS} ${CROSS_CFLAG}" \
+CPPFLAGS="${CROSS_CPPFLAG}" \
+LDFLAGS="${CROSS_LDFLAG}" \
+CROSS="${CROSS_ARG}" \
+    ./configure \
+        ${TARGET_ARG} \
         "--prefix=${DEP_PREFIX}" \
         --enable-shared \
         --disable-static \
@@ -42,3 +56,7 @@ CFLAGS=${ARCH_FLAGS} CROSS="${MINGW_ARCH}-w64-mingw32-" \
 
 make -j "${MAKE_JOBS}"
 make install
+
+if [ "${SCRIPT_ARCH}" == "macos" ]; then
+    install_name_tool -id '@rpath/libvpx.dylib' ${DEP_PREFIX}/lib/libvpx.dylib
+fi