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patch: delete files for tests before test run

we shouldn't mutate the stae of checked in files in place
in tests

--- a/sys/src/cmd/test/patch/mkfile

+++ b/sys/src/cmd/test/patch/mkfile

@@ -2,4 +2,8 @@

 TEST=patch

+CLEANFILES=\

+	multifile.1.in.tmp\

+	multifile.2.in.tmp\

+

 </sys/src/cmd/mktest

--- a/sys/src/cmd/test/patch/multifile.patch

+++ b/sys/src/cmd/test/patch/multifile.patch

@@ -1,4 +1,4 @@

---- multifile2.in

+--- multifile2.in.tmp

 +++ multifile2.out

 @@ -1,21 +1,19 @@

 -77777

@@ -31,7 +31,7 @@

 of course, each patch can have its own comment

 lines mixed in, so we should handle these.

---- multifile1.in

+--- multifile1.in.tmp

 +++ multifile1.out

 @@ -14,16 +14,6 @@

  12

--- a/sys/src/cmd/test/patch/patch.rc

+++ b/sys/src/cmd/test/patch/patch.rc

@@ -23,9 +23,11 @@

 ../../$O.patch delete.patch

 test ! -f delete.out

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

-chmod 640 multifile1.in

-chmod 400 multifile2.in

+rm -f multifile^(1 2)^.out multifile^(1 2)^.in.tmp

+cp multifile1.in multifile1.in.tmp

+cp multifile2.in multifile2.in.tmp

+chmod 640 multifile1.in.tmp

+chmod 400 multifile2.in.tmp

 ../../$O.patch multifile.patch

 check multifile1.out multifile1.expected

 check multifile2.out multifile2.expected

@@ -34,6 +36,4 @@

 	exit misperm1

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

 	exit misperm2

-

-

 status=()