Force thread flags for all Unixware builds if threading is requested.

This is required because once you link with a library that uses threads,
all references to that library have to use thread flags.

src/Makefile.global.in

 # -*-makefile-*-
-# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.182 2004/05/11 21:57:14 momjian Exp $
+# $PostgreSQL: pgsql/src/Makefile.global.in,v 1.183 2004/05/13 23:05:54 momjian Exp $
 
 #------------------------------------------------------------------------------
 # All PostgreSQL makefiles include this file and use the variables it sets,
@@ -177,6 +177,12 @@ ifeq ($(GCC), yes)
   CFLAGS += -Wall -Wmissing-prototypes -Wmissing-declarations
 endif
 
+# Unixware needs threads for everything that uses libpq
+ifeq ($(PORTNAME),unixware)
+  CFLAGS += "$PTHREAD_CFLAGS"
+endif
+
+
 # Kind-of compilers
 
 YACC = @YACC@