No longer forces predefinition of __unix__ (makes cross-platform makefile easier)

src/sbbs3/conwrap.c

@@ -7,10 +7,7 @@
 
 /* @format.tab-size 4, @format.use-tabs true */
 
-#ifndef __unix__
-    // This *should* work for most unices, as termios is pretty standard
-	#error This file is only to be used in a UNIX build
-#endif
+#ifdef __unix__
 
 #include <stdlib.h>
 #include <unistd.h>
@@ -112,5 +109,4 @@ int getch(void)
     return c;
 }
 
-
-
+#endif // __unix__
\ No newline at end of file