tests/test-hgk.t

patch: write .rej files without rewriting EOLs

Do not pass reject file content to patchfile.writelines() to:
- Avoid line endings transformations
- Avoid polluting overriding implementations with unrelated data. They should
  override write_rej() to deal or ignore reject files properly.

Bug report, analysis and original patch and test by
Shun-ichi GOTO <[e-mail]>

Minimal hgk check

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "hgk=" >> $HGRCPATH
  $ hg init repo
  $ cd repo
  $ echo a > a
  $ hg ci -Am adda
  adding a
  $ hg debug-cat-file commit 0
  tree a0c8bcbbb45c
  parent 000000000000
  author test 0 0
  committer test 0 0
  revision 0
  branch default
  
  adda