tests: fix test-patch.t on pickier /bin/sh implementations
This is a graft of
0b39edeff033 and
f44306940c94 from default because
I'm tired of seeing the FreeBSD build be red on stable. See those
revisions for details on what's going on here.
$ rm -rf a
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am0
adding a
$ hg tag t1 # 1
$ hg tag --remove t1 # 2
$ hg co 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg tag -f -r0 t1
$ hg tags
tip 3:a49829c4fc11
t1 0:f7b1eb17ad24
$ cd ..