clean up gitignore files

Rather than listing explicit object files, ignore all of them in
the whole tree.

Also ignore patch/gdb related files throughout.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

.gitignore

@@ -1 +1,16 @@
 *.bz2
+
+*.diff
+*.patch
+*.orig
+*.rej
+
+core
+.gdb_history
+.gdbinit
+
+.depend
+*.a
+*.o
+*.So
+lib*.so