gdb: add upstream patch to fix inconsistency with glibc header

gdb: add upstream patch to fix inconsistency with glibc header

In glibc 2.25, the proc_service.h header was copied from gdb to glibc.
However, in the process the 'const' was removed, which leads to build
failures with glibc >= 2.25.

gdb 7.12.1 already contains this patch. The patch for 7.11.1 comes
straight from upstream, the patch for 7.10.1 is backported by me.

Fixes http://autobuild.buildroot.net/results/6b1b44e72147113b3f0e3f049cb9026d6c7dffb7

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>