build: ignore scissor line for the commit-msg hook
build: ignore scissor line for the commit-msg hook

* build-aux/git-hooks/commit-msg: Stop processing more lines when the
  scissor line is encountered.
--
This allows the command `git commit -v` to work even if the code is
longer than 72 characters. Note that comments are already ignored by the
previous line.

Signed-off-by: Peter Wu <4b8373d016f277527198385ba72fda0feb5da015@lekensteyn.nl>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme