Add myself as a maintainer.

Change-Id: Ie1b0cb082a384144eef327e9294949e9bacc4415
Fix build error in sol-thread.c:info_cb

gdb/ChangeLog:

        * sol-thread.c (info_cb) [ti.ti_startfunc != 0]: Change type
        of local variable msym to const struct bound_minimal_symbol.
        Adjust use accordingly.
        [ti.ti_state == TD_THR_SLEEP]: Likewise.