use SDL2 as ifdef symbol because we're not really sdl1.3 compatible, change the compatibility layer, drop unused code, add some documentation
#ifndef HEDGEWARS_PACKAGES_MOUNTER_H
#define HEDGEWARS_PACKAGES_MOUNTER_H
#include "physfs.h"
#ifdef __cplusplus
extern "C" {
#endif
PHYSFS_DECL void hedgewarsMountPackages();
PHYSFS_DECL void hedgewarsMountPackage(char * fileName);
#ifdef __cplusplus
}
#endif
#endif