Patch merged into coreboot/master: buildgcc: Update gdb and expat

the following patch was just integrated into master:
commit 498f3d0cd59d3c3e6ff2ef43f24e205b249556f8
Author: Stefan Reinauer 
Date:   Thu Apr 21 18:10:15 2016 -0700

buildgcc: Update gdb and expat

Update gdb to 7.11 and expat to 2.1.1
    riscv64-elf is still broken.

Change-Id: Id7605f4274fcb15f9c3e366f5c492328f70f7956
    Signed-off-by: Stefan Reinauer 
    Reviewed-on: https://review.coreboot.org/14461
    Tested-by: build bot (Jenkins)
    Reviewed-by: Idwer Vollering

See https://review.coreboot.org/14461 for details.

-gerrit