code: regress

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patch: test preservation of permissions.

--- a/cmd/patch/patch.rc

+++ b/cmd/patch/patch.rc

@@ -24,8 +24,16 @@

 test ! -f delete.out

 rm -f multifile^(1 2)^.out

+chmod 640 multifile1.in

+chmod 400 multifile2.in

 patch multifile.patch

 check multifile1.out multifile1.expected

 check multifile2.out multifile2.expected

+

+if(! ~ `{walk -ex multifile1.out} --rw-r-----)

+	exit misperm1

+if(! ~ `{walk -ex multifile2.out} --rw-------)

+	exit misperm2

+

 status=()