gitignore: add the various autotools generated stuff

cde/.gitignore

@@ -2440,3 +2440,19 @@ util/scripts/xmkmf
 debian/cde-desktop
 debian/patches
 debian/.debhelper
+
+# autotools things...
+Makefile.in
+.deps
+aclocal.m4
+autom4te.cache/
+config.log
+config.status
+configure
+include/config.h
+include/config.h.in
+include/stamp-h1
+libtool
+m4/
+
+