libraries/physfs: Miscellaneous cleanups.
libraries/physfs: Miscellaneous cleanups.

  Cleaned up build and added some fixes for slackware 13.1.

panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds