This reverts commit
3780fc679cc428c1f211e1728c4281ca15e9746b.
HP-UX didn't like it. There would probably be a way to fix that, but
since the net effect of all of this is zero because ecpg ends up using
libpq anyway, it's not worth bothering further.
-I$(libpq_srcdir) -I$(top_srcdir)/src/include/utils $(CPPFLAGS)
override CFLAGS += $(PTHREAD_CFLAGS)
-SHLIB_LINK = -L../ecpglib -lecpg -L../pgtypeslib -lpgtypes \
+SHLIB_LINK = -L../ecpglib -lecpg -L../pgtypeslib -lpgtypes $(libpq) \
$(filter -lintl -lm, $(LIBS)) $(PTHREAD_LIBS)
SHLIB_PREREQS = submake-ecpglib submake-pgtypeslib