- (djm) [configure.ac aclocal.m4] More tests to detect fallout from
   platform hardening options: include some long long int arithmatic
   to detect missing support functions for -ftrapv in libgcc and
   equivalents, actually test linking when -ftrapv is supplied and
   set either both -pie/-fPIE or neither. feedback and ok dtucker@
 - (tim) [session.c] Improve error reporting on set_id().