[Mono-list] mono-build-w32.sh has warnings

[Miguel de Icaza]

> These warnings appeared after updating to autoconf-2.53-devel.
> Cygwin's wrapper uses devel package by default.
> To make sure that stable version (2.13) is used the following snippet can be used (in the build script),
> as a temporal "fix", if warnings are too annoying :-)
> I use it just to make sure that 2.13 is used in both builds (Linux and Windows).
> 
> if [ ! -z "${AUTO_STABLE}" -o -e /usr/autotool/stable ]; then
>  export AUTO_STABLE=${AUTO_STABLE:-/usr/autotool/stable}
>  export AUTO_DEVEL=${AUTO_STABLE}
> fi

Thanks for the pointer.  Although maybe it makes sense to move to the
new versions of autoconf?

Miguel