autogen.sh: replace test -e with test -x for mkinstalldirs to be more portable.

Original commit message from CVS:
2004-02-22  Benjamin Otte  <otte@gnome.org>

reported by: Padraig O'Briain <padraig.obriain@sun.com>

* autogen.sh:
replace test -e with test -x for mkinstalldirs to be more portable.
(fixes #134816)
3 files changed