compression fix fix

Ken:
Fix an error in my fix for compression error messages.

No Makefile.src change should be necessary because files.c depends on hack.h,
which "depends" on wintty.h (actually ifdef USE_TRAMPOLI, but the Makefile
doesn't know that).

src/files.c

@@ -730,7 +730,7 @@ boolean uncomp;
 	 * end up being displayed after the error message.
 	 */
 	if (istty)
-	    wait_synch();
+	    mark_synch();
 # endif
 	if (f == 0) {	/* child */
 # ifdef TTY_GRAPHICS