Linux specific bug and patch posted to sdk bugs forum

The article contains a linux specific patch to x86UNIXFileio.cc that fixes some problems mostly seen in the various editors. The normal way one would see the problem is by loading a shape in the -show mod or other files, like terrain textures, in the editor.

Without the patch above, the linux version of TGE's LoadFileDlg shows all files in the entire directory hierarchy that match the filespec when it should only be displaying those files from the currently selected directory.