Add needed #include.
authorTom Lane <tgl@sss.pgh.pa.us>
Mon, 19 Nov 2018 22:28:05 +0000 (17:28 -0500)
committerTom Lane <tgl@sss.pgh.pa.us>
Mon, 19 Nov 2018 22:28:05 +0000 (17:28 -0500)
commit0064d0e9f44fadb9b8cbf9908356f7e22bb17d34
treef49ee568017c8b06211e0f3b5b73098c28bdae7c
parent8285fae0706f7ab148257e9b5bcfa1f636fa3685
Add needed #include.

Per POSIX, WIFSIGNALED and related macros are provided by <sys/wait.h>.
Apparently on Linux they're also pulled in by some other inclusions,
but BSD-ish systems are pickier.  Fixes portability issue in ffa4cbd62.

Per buildfarm.
src/backend/commands/copy.c