[arch-dev-public] boost 1.50.0 update

Hello, The most important change from this version is the removing of filesystem version 2. As far I can see, we have several packages in our repos that are using this version explicitly. gpsdrive fatrat mapnik pokerth smc It may be more but soon we will find out as soon as I'm pushing the rebuild to staging. Try to find out if he affected packages have filesystem v3 support in a newer version(or if patches are available). -- Ionuț