[PATCH] kbuild: ignore all debugging info sections in scripts/reference_discarded.pl

GCC 4 emits more DWARF debugging information than before and there is now a
.debug_loc section as well.  This causes "make buildcheck" to fail.  Rather
than just add that one to the special case list, I used a regexp to ignore
any .debug_ANYTHING sections in case more show up in the future.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>