Workaround to unbreak rpm2cpio.

From jasoni@, ultimately from FreeBSD.  ok espie@

misc/rpm/patches/patch-rpm2cpio_c

@@ -0,0 +1,12 @@
+$OpenBSD: patch-rpm2cpio_c,v 1.1 2001/08/28 19:55:30 naddy Exp $
+--- rpm2cpio.c.orig	Tue Aug 14 17:17:09 2001
++++ rpm2cpio.c	Tue Aug 14 17:17:42 2001
+@@ -55,7 +55,7 @@ int main(int argc, char **argv)
+     }
+ 
+     gzdi = Fdopen(fdi, rpmio_flags);	/* XXX gzdi == fdi */
+-    if (gzdi == NULL || Ferror(gzdi)) {
++    if (gzdi == NULL) {
+ 	fprintf(stderr, _("cannot re-open payload: %s\n"), Fstrerror(gzdi));
+ 	exit(EXIT_FAILURE);
+     }