mailinfo: move patch_lines to struct mailinfo
mailinfo: move patch_lines to struct mailinfo

This one is trivial thanks to previous steps that started passing
the structure throughout the input codepaths.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git