pg_ctl: Adjust nls.mk for split out of wait_error.c

src/bin/pg_ctl/nls.mk

 # src/bin/pg_ctl/nls.mk
 CATALOG_NAME     = pg_ctl
 AVAIL_LANGUAGES  = de es fr it ja ko pt_BR ru sv ta tr zh_CN zh_TW
-GETTEXT_FILES    = pg_ctl.c ../../common/fe_memutils.c ../../port/exec.c
+GETTEXT_FILES    = pg_ctl.c ../../common/fe_memutils.c ../../port/exec.c ../../port/wait_error.c