Fix "-v" in the Windows console utilities (plink, pscp, psftp).

I'm not convinced I've done this the right way (I've introduced a static for
logctx in console.c) but it will do for now.

[originally from svn r2674]

plink.c

@@ -548,6 +548,7 @@ int main(int argc, char **argv)
 	}
 	logctx = log_init(NULL, &cfg);
 	back->provide_logctx(backhandle, logctx);
+	console_provide_logctx(logctx);
 	sfree(realhost);
     }
     connopen = 1;