Re: [sr #110448] AC_CONFIG_AUX_DIRS fails with Windows paths

[Even after registering and logging in, I could not figure out how
 to post a comment to this SR on savannah.  If there's an entry in
 the FAQ or the cookbook, it's not easily found.]

> URL:
>   <https://savannah.gnu.org/support/?110448>
>              Summary: AC_CONFIG_AUX_DIRS fails with Windows paths
...
>     Originator Email: [email protected]
...
> Details:
>
> Updating to autoconf 2.70 broke the build of GHC (Haskell
> compiler) on Windows using msys2. I've tracked this to commit
> 35a1c64600894ecc3b06b6c4b273952db7c8fc83
...
> This commit changed the way the auxiliary dirs are managed. They
> were put in a space separated list and now they are put in a
> $PATH_SEPARATOR separated list.
...
> But $PATH_SEPARATOR=":"

Intuitively, I would expect PATH_SEPARATOR to be ";" on Windows
(unless you're using CygWin).