set defaults to build java code, and use java, ant, and perl from PATH for external builds

nsconfig.mk

@@ -75,6 +75,10 @@ else
 	USE_DSGW:=1
 	USE_JAVATOOLS:=1
 	USE_SETUPUTIL:=1
+	GET_JAVA_FROM_PATH := 1
+	GET_ANT_FROM_PATH := 1
+	USE_PERL_FROM_PATH := 1
+	BUILD_JAVA_CODE := 1
 endif
 
 include $(BUILD_ROOT)/nsdefs.mk