[gegl] build: Abort as soon as autoreconf fails

[Debarshi Ray <debarshir src gnome org>]

commit c3b9eca35241b43f86429b022562bba5d5b328d6
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed May 9 15:07:31 2018 +0200

    build: Abort as soon as autoreconf fails
    
    ... as suggested in the autogen.sh template given in:
    https://wiki.gnome.org/Projects/GnomeCommon/Migration
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795901

 autogen.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 55fae8c..197a912 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -21,7 +21,7 @@ if test -z $AUTORECONF; then
         exit 1
 fi
 
-autoreconf --force --install --verbose
+autoreconf --force --install --verbose || exit 1
 
 cd $ORIGDIR
 test -n "$NOCONFIGURE" || "$srcdir/configure" "$@"