Exclude tcp->pfd from non-procfs systems

* defs.h: Make struct tcb::pfd fields conditional on USE_PROCFS.
* strace.c (alloc_tcb): Use tcp->pfd only if USE_PROCFS.
(droptcb): Likewise.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
2 files changed