PhysicsFS is a library to provide abstract access to various archives. See
http://icculus.org/physfs/ for more information.
This addon makes it possible to read and write files (on disk or inside archives) using PhysicsFS, through Allegro's file I/O API. For example, that means you can use the Image I/O addon to load images from .zip files.
These functions are declared in the following header file. Link with allegro_physfs.
This functions only affects the thread it was called from.
See also: al_set_new_file_interface.
Returns the (compiled) version of the addon, in the same format as al_get_allegro_version.