quilt/mail: Remove procmail dependency

quilt depends on procmail because 'quilt mail' requires formail.
However, formail is only used to extract header values from messages.
Since quilt already requires sed we can replace formail -x uses with
sed instead.  The sed script is slightly complicated because it
needs to handle the case of "Long Header Fields" definied in RFC
2822, but essentially all it's doing is: look for the first line
beginning with the name of header we are looking for, and print
every line until one that does not start with blanks.

0 files changed, 0 insertions, 0 deletions