try fixing autoreconf error with homebrew

```
+ cd libssh2
+ rm -r -f x64-musl bld
+ '[' -f configure ']'
+ autoreconf --force --install
Can't exec "aclocal": No such file or directory at /usr/local/Cellar/autoconf/2.71/share/autoconf/Autom4te/FileUtils.pm line 274.
autoreconf: error: aclocal failed with exit status: 2
```
Ref: https://github.com/vszakats/curl-for-win/actions/runs/6392970919/job/17351293395#step:3:4308

_ci-mac-homebrew.sh

@@ -21,7 +21,7 @@ fi
 
 if [ -n "${extra}" ]; then
  export HOMEBREW_NO_AUTO_UPDATE=1
-  export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
+# export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
  export HOMEBREW_NO_ANALYTICS=1
  export HOMEBREW_NO_ANALYTICS_MESSAGE_OUTPUT=1
  brew update >/dev/null || true