Fix standalone Android and NaCl Makefiles to support arm_version=7 and optdebug

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/116423002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18315 ce2b1a6d-e550-0410-aec6-3dcde31c8c00