Fixes SASL compilation under Xcode 4.5
Fixes SASL compilation under Xcode 4.5

* Adds support for armv7s
* Correctly identifies when to use gcc instead of clang

jjz/libetpan,jjz/libetpan,tipbit/libetpan,disaykin/libetpan,tipbit/libetpan,tipbit/libetpan,disaykin/libetpan,disaykin/libetpan,jjz/libetpan