[PING][PATCH] Remove -ffunction-sections debugging warning (PR libstdc++/35597)

[David Edelsohn]

	Debugging with -ffunction-sections works on AIX and on Cygwin, as
reported in PR 35597.

	The referenced patch removes the -ffunction-sections warning,
which also prevents building libstdc++ on targets that support
-ffunction-sections but have not commented out the debugging warning.

http://gcc.gnu.org/ml/gcc-patches/2008-03/msg00975.html

Thanks, David