This makes the configuration option purpose clearer. Previously,
some distros enabled the option thinking it turned on a "regex" option
that should be enabled.
Closes #89.
dnl AIX may not have fchdir()
AC_CHECK_FUNCS(fchdir, , [mutt_cv_fchdir=no])
-AC_ARG_WITH(regex, AS_HELP_STRING([--with-regex],[Use the GNU regex library]),
+AC_ARG_WITH(bundled-regex,
+ AS_HELP_STRING([--with-bundled-regex],[Use the bundled GNU regex library]),
[mutt_cv_regex=yes],
[AC_CHECK_FUNCS(regcomp, mutt_cv_regex=no, mutt_cv_regex=yes)])