Fix for non-Linux and Solaris build bustage. r=sgehani

modules/libreg/Makefile.in

@@ -26,7 +26,11 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS		= include src standalone
+DIRS		= include src
+
+ifneq (,$(filter Linux SunOS,$(OS_ARCH)))
+DIRS		+= standalone
+endif
 
 include $(topsrcdir)/config/rules.mk