* app/interface.c: minor unused variable warning cleanup

* plug-ins/bumpmap/bumpmap.c: another warning cleanup

* plug-ins/flame/flame.c: time(NULL) instead of time(0)

* plug-ins/gpc/Makefile.am
* plug-ins/megawidget/Makefile.am: install in $libdir instead of
$gimpplugindir since they *are* libs. Some archs try to exec them, and it
barfs

-Yosh