[Gpe-list] gpe-edit: fix mime-handlers install

[Geoff Levand]

Fixes this install error:

test -z "/etc/mime-handlers" || mkdir -p -- "/etc/mime-handlers"
mkdir: cannot create directory `/etc/mime-handlers': Permission denied
make[2]: *** [install-mimeDATA] Error 1

---
Hi,

I had some trouble with gpe-edit when specifing a prefix.  This
fix seemed to work.

-Geoff

--- a/gpe-edit-0.40/Makefile.am	2007-03-30 14:18:06.000000000 -0700
+++ b/gpe-edit-0.40/Makefile.am	2007-09-30 17:14:04.000000000 -0700
@@ -26,7 +26,7 @@
appregdir = $(datadir)/application-registry
appreg_DATA = gpe-edit.applications

-mimedir = /etc/mime-handlers
+mimedir = $(datadir)/etc/mime-handlers
mime_DATA = gpe-edit.mime

EXTRA_DIST = $(desktop_DATA) \