Fix Py2Exe / Py2App
Fix Py2Exe / Py2App

Fixes the C PoW loading in frozen apps (Windows and OSX)
Cleaner fallback in PoW if something goes wrong

bmng-dev/PyBitmessage,torifier/PyBitmessage,torifier/PyBitmessage,bmng-dev/PyBitmessage,debguy0x/PyBitmessage,hb9kns/PyBitmessage,timothyparez/PyBitmessage,hb9kns/PyBitmessage,hb9kns/PyBitmessage,debguy0x/PyBitmessage,timothyparez/PyBitmessage,bmng-dev/PyBitmessage,debguy0x/PyBitmessage,hb9kns/PyBitmessage,timothyparez/PyBitmessage,torifier/PyBitmessage,debguy0x/PyBitmessage,timothyparez/PyBitmessage,torifier/PyBitmessage