libgnome-panel: fix builddir != srcdir
This fixes a regression introduced by commit e31cb41a.
Adding Makefile.am to gp-enum-types.{c,h} ensures that enum-types are also regenerated when the Makefile.am changes.
This fixes a regression introduced by commit e31cb41a.
Adding Makefile.am to gp-enum-types.{c,h} ensures that enum-types are also regenerated when the Makefile.am changes.