buildgcc: Update and fix GDB

GDB stopped building ever since we updated from version 7.6
but nobody noticed ;)
Update from 7.9 to 7.9.1 and bring the required patches forward.

Change-Id: I2f357525a46d5540e9f57b80d830943bbd5dfcaf
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10494
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
diff --git a/util/crossgcc/sum/expat-2.1.0.tar.gz.cksum b/util/crossgcc/sum/expat-2.1.0.tar.gz.cksum
new file mode 100644
index 0000000..23ee87a
--- /dev/null
+++ b/util/crossgcc/sum/expat-2.1.0.tar.gz.cksum
@@ -0,0 +1 @@
+b08197d146930a5543a7b99e871cba3da614f6f0  tarballs/expat-2.1.0.tar.gz