[PATCH 2/2] malloc/obstack: Merge from gnulib

[Roland McGrath]

> There are places where 8 spaces could be replaced with tabs, but I
> don't know if we should stick to the 8 spaces style of gnulib to
> maintain consistency.

In general I think the current protocol is to do space->tab replacement
mechanically the same way we replace the license text.  So if we are at the
point where the gnulib source file after those mechanical changes matches
what we have in libc, we are done.