Switch to GDB 7.9

Signed-off-by: Anton Kolesov <[email protected]>

Author: anthony-kolesov

config/arc-dev.sh

@@ -1,7 +1,7 @@
 cgen=cgen:arc-1.0-dev
 binutils=binutils:arc-2.23-dev
 gcc=gcc:arc-4.8-dev
-gdb=gdb:arc-7.5-dev
+gdb=gdb:arc-7.9-dev
 newlib=newlib:arc-2.0-dev
 uclibc=uClibc:arc-mainline-dev
 linux=linux:arc-3.13