package/gdb: bump to version 8.2

Rebase existing patches on gdb 8.2.

https://sourceware.org/ml/gdb-announce/2018/msg00003.html

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
8 files changed