ref: eb8b4d9a99146d9494d8d28402deb1fb4fe3202f
parent: 0ee525d6deff6f047bc152119dd74a0149b815f3
author: James Berry <jamesberry@google.com>
date: Mon Jan 24 11:48:21 EST 2011
configure.sh fix for visual studio -For targets with external build systems like visual studio CC is not set so check_add_cflags will fail. Only call this function if extra_cflags is set. Change-Id: I3531bad69e9b6a59c5be1b0e8b6053ccccbc332c