windows - set process priority class to ABOVE_NORMAL_PRIORITY_CLASS previous default was NORMAL_PRIORITY_CLASS before today

add timerfd support to the core for now you must enable it in switch.conf.xml with the param enable-softtimer-timerfd=true later if it proves to work well we can make it on by default, please test if you have a new kernel that supports this option kernel >= 2.6.25 and libc >= 2.8

revert 44bfcf1d this breaks the build for everyone who does not have python-dev package