version-script: add GCC/Clang optimization level
add GCC/Clang optimization level to version-script
project: don't treat warnings as errors
getversion.sh: Use PlistBuddy instead of agvtool to get the version for
release builds. agvtool does not work if there are mulitple projects in the
Vienna directory.
merge from 725cb476. getversion.sh and Vole_xc4.xcodeproj