Attempt to use xctoolchain for clang32 bootstrap

clang32-bootstrap.sh

@@ -12,7 +12,7 @@ CHMOD="/bin/chmod"
 CURL="/usr/bin/curl"
 MKDIR="/bin/mkdir"
 RM="/bin/rm"
-UNZIP="/usr/bin/unzip"
+TAR="/usr/bin/tar"
 
 if [ -z "${OVERRIDE_PYTHON3}" ]; then
   # Use whatever is in PATH
@@ -27,7 +27,7 @@ CLANG32_SCRIPTS=(
   "libtool32"
 )
 
-CLANG32_ZIP="clang-12.zip"
+CLANG32_ZIP="ACID32.xctoolchain.tar.xz"
 
 "${CURL}" -LfsO "https://github.com/acidanthera/ocbuild/releases/download/llvm-kext32-latest/${CLANG32_ZIP}" || ret=$?
 if [ $ret -ne 0 ]; then
@@ -39,7 +39,7 @@ if [ $ret -ne 0 ]; then
   abort "Failed to create clang32 directory with code ${ret}"
 fi
 
-"${UNZIP}" -q "${CLANG32_ZIP}" -d "${CLANG32_DIR}" || ret=$?
+"${TAR}" -xf "${CLANG32_ZIP}" -C "${CLANG32_DIR}" || ret=$?
 if [ $ret -ne 0 ]; then
   abort "Failed to extract downloaded clang32 with code ${ret}"
 fi
@@ -64,3 +64,5 @@ done
 if [ $ret -ne 0 ]; then
   abort "Failed to install macholib with code ${ret}"
 fi
+
+echo "EXTERNAL_TOOLCHAINS_DIR=${!CLANG32_DIR}" >> "$GITHUB_ENV"