Add HAVE_Cplusplus= true to BSD44_derived Makefile.inc, as I know that

FreeBSD/NetBSD both ship with gcc 2.7.x

src/backend/port/BSD44_derived/Makefile.inc

@@ -7,7 +7,7 @@
 #
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/backend/port/BSD44_derived/Attic/Makefile.inc,v 1.2 1996/10/18 04:46:50 scrappy Exp $
+#    $Header: /cvsroot/pgsql/src/backend/port/BSD44_derived/Attic/Makefile.inc,v 1.3 1996/10/19 06:36:52 scrappy Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -17,6 +17,8 @@
 #
 LDADD+= -ll
 
+HAVE_Cplusplus= true
+
 #
 # 4.4-lite BSD-derived OSs have a little trouble with partially-implemented
 # dynamic loading soutines. See the comments in port-protos.h.