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[driver] Discard error messages not from cc1

--- a/driver/posix/scc.c

+++ b/driver/posix/scc.c

@@ -7,6 +7,7 @@

 #include <unistd.h>

 #include <errno.h>

+#include <fcntl.h>

 #include <limits.h>

 #include <signal.h>

 #include <stdio.h>

@@ -55,6 +56,7 @@

 static size_t tmpdirln;

 static struct items objtmp, objout;

 static int Mflag, Eflag, Sflag, cflag, kflag, sflag;

+static int devnullfd;

 extern int failure;

@@ -246,6 +248,8 @@

 			dup2(t->out, 1);

 		if (t->in > -1)

 			dup2(t->in, 0);

+		if (tool != CC1)

+			dup2(devnullfd, 2);

 		execvp(t->cmd, t->args.s);

 		fprintf(stderr, "scc: execvp %s: %s\n",

 		        t->cmd, strerror(errno));

@@ -506,6 +510,9 @@

 	if (!(tmpdir = getenv("TMPDIR")) || !tmpdir[0])

 		tmpdir = ".";

 	tmpdirln = strlen(tmpdir);

+

+	if ((devnullfd = open("/dev/null", O_WRONLY)) < 0)

+		fputs("scc: could not open /dev/null\n", stderr);

 	build(&linkchain, (link = !(Mflag || Eflag || Sflag || cflag)));