asterisk:
 * split CFLAGS in "optimization flags" and "all other flags", pass optimization flags in OPTIMIZE and all other flags in CFLAGS - this is the way asterisk expects them to be passed
 * refs #706


git-svn-id: file:///var/svn/freetz/trunk@11647 149334a1-2f27-0410-a3b9-fc62619ac1e6