Merge branch 'jt/mailinfo-fold-in-body-headers'

When "git format-patch --stdout" output is placed as an in-body header and it uses the RFC2822 header folding, "git am" failed to put the header line back into a single logical line. The underlying "git mailinfo" was taught to handle this properly. * jt/mailinfo-fold-in-body-headers: mailinfo: handle in-body header continuations mailinfo: make is_scissors_line take plain char * mailinfo: separate in-body header processing