phyfs library issues

1. No support for native file system file names encoding.

This mean on windows with default phyfs builds and non english user names ManaPlus may not works. Official ManaPlus builds for windows using ancient physfs binary what still support non utf8 paths. Sadly i not sure what exact phyfs version works like this.

2. With latest zlib version phyfs cant read most files from zip archives.

For fix this issue need apply patch to fix it. Some GNU/Linux distros already patched physfs. But upstream still not released patched.

Demo program for see libphysfs bug: