_ci-mac-homebrew.sh: install rosetta on arm appveyor runner

Author: vszakats

_ci-mac-homebrew.sh

@@ -13,6 +13,11 @@ if [[ "${CW_CONFIG:-}" != *'mac'* ]] || [[ "${CW_CONFIG:-}" = *'llvm'* ]]; then
 fi
 
 if [[ "${CW_CONFIG:-}" = *'win'* ]]; then
+  if [ -n "${APPVEYOR_ACCOUNT_NAME:-}" ] && \
+     [ "$(uname -m)" = 'arm64' ] && \
+     [ ! -f '/Library/Apple/usr/libexec/oah/libRosettaRuntime' ]; then
+    softwareupdate --install-rosetta --agree-to-license
+  fi
   extra+=' mingw-w64 osslsigncode wine-stable openssh'
   if [[ "${CW_CONFIG:-}" = *'boringssl'* ]] || [[ "${CW_CONFIG:-}" = *'awslc'* ]]; then
     extra+=' nasm'