Some improvements in footprint generation

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@586 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip-apps/build/Footprint.mak b/pjsip-apps/build/Footprint.mak
index b3dd1ed..735aef2 100644
--- a/pjsip-apps/build/Footprint.mak
+++ b/pjsip-apps/build/Footprint.mak
@@ -49,3 +49,5 @@
 clean:
 	rm -f $(EXE)
 
+print_name:
+	@echo $(MACHINE_NAME) $(OS_NAME) $(CC_NAME) `$(CC_NAME) -dumpversion`