Unbreak Windows builds broken by pgpipe removal.

Author: adunstan

src/backend/port/Makefile

@@ -23,10 +23,6 @@ include $(top_builddir)/src/Makefile.global
 
 OBJS = dynloader.o pg_sema.o pg_shmem.o pg_latch.o $(TAS)
 
-ifneq (,$(filter $(PORTNAME),cygwin win32))
-OBJS += pipe.o
-endif
-
 ifeq ($(PORTNAME), darwin)
 SUBDIRS += darwin
 endif