1. Solved recent breakage due to converting SDL library to use stock c_r
library instead of linuxthreads;
2. port now uses SDL_mixer and mkmod libraries instead of its own custom
versions;
3. port's Makefile and patches has been cleaned to remove mandatory items.
"""
PR: 18192
Submitted by: "Maxim Sobolev" <sobomax@altavista.net>