made for Linux

[tissatussa]

hi, although this project is 8 years old, i managed to convert the code for Linux, see this ZIPped source : xoron-master-build-196-repaired-for-linux-with-ChatGPT.zip

i had to adjust many code parts, and now compilation gives no errors and warnings. I had to add a .h file to make it all work. My adjusted code contains if-else clauses for Windows and Linux (POSIX), so it should still be possible to compile it on Windows, although i couldn't test that.

the compiled binary is 51.1 Kb in size and runs fine in CuteChess GUI.