invoke pgp correctly.

Reference: /n/sources/patch/applied/marshal-p-fix
Date: Thu Dec 22 00:58:49 CET 2005

--- /sys/src/cmd/upas/marshal/marshal.c	Thu Dec 22 00:57:52 2005
+++ /sys/src/cmd/upas/marshal/marshal.c	Thu Dec 22 00:57:47 2005
@@ -1125,6 +1125,7 @@
 	v = av = emalloc(sizeof(char*)*8);
 	ac = 0;
 	v[ac++] = "pgp";
+	v[ac++] = "-fat";		/* operate as a filter, generate text */
 	if(pgpflag & PGPsign)
 		v[ac++] = "-s";
 	if(pgpflag & PGPencrypt)
@@ -1144,7 +1145,9 @@
 		dup(fd, 1);
 		close(fd);
 
-		exec("/bin/upas/pgp", av);
+		/* add newline to avoid confusing pgp output with 822 headers */
+		write(1, "\n", 1);
+		exec("/bin/pgp", av);
 		fatal("execing: %r");
 		break;
 	default: