[patch][core] Use AS_AC_EXPAND instead of trying to make our own

[Simon McVittie]

On Mon, 21 May 2007 at 18:29:21 +0100, Simon McVittie wrote:
> On a current Debian unstable system, ${datadir} is defined in terms of
> ${datarootdir}, so EXPANDED_DATADIR needs to be expanded recursively.
> Rather than fixing configure.in to do this, I grabbed the AS_AC_EXPAND
> macro from autostars.sf.net, which seems to be commonly used.

This was in an attempt to make "make check" (let alone "make distcheck")
pass, which it still doesn't - I'll resume trying to fix "make check"
tomorrow.

	Simon