uclibc/0.9.33.2: Rename MIPS' siginfo _timer members

Backport an upstream patch to fix a compilation problem of strace-4.9+
on MIPS platforms with uClibc.

Upstream commit:
  http://git.uclibc.org/uClibc/commit/?id=a1b88fe87a9d2be5696247d266f5c4fd20f000bb

Fixes:
  http://autobuild.buildroot.net/results/e8f/e8f4965b27c9dcc58d6ec77cdc48b83c218c5bec/



Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>