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.
Branch
------
REL_10_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/0064d0e9f44fadb9b8cbf9908356f7e22bb17d34
Modified Files
--------------
src/backend/commands/copy.c | 1 +
1 file changed, 1 insertion(+)