Remove the remnants of OS/2 support.

This has never worked in any modular server release, and as far as I know
was never tested in 6.7 through 6.9.

hw/xfree86/loader/loadmod.c

@@ -118,12 +118,7 @@ static char **defaultPathList = NULL;
 static Bool
 PathIsAbsolute(const char *path)
 {
-#ifdef __UNIXOS2__
-    return (*path == '/' || (strlen(path) > 2 && isalpha(elem[0]) &&
-		elem[1] == ':' && elem[2] == '/'));
-#else
     return (*path == '/');
-#endif
 }	
 
 /*