build: fix build if siginfo_t lacks si_timerid/si_overrun

* configure.ac (AC_CHECK_MEMBERS): Check for siginfo_t.si_timerid and
siginfo_t.si_overrun.
* signal.c (printsiginfo) [SI_TIMER]: Check HAVE_SIGINFO_T_SI_TIMERID
and HAVE_SIGINFO_T_SI_OVERRUN.
2 files changed