buildgcc: Don't run autoconf

gcc and binutils fixed their upstream tar balls, and running
autoconf created more problems than it solved

Change-Id: I0003dd597f521701405ff35923214435136b262d
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10486
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
1 file changed