git-send-email: do not pass custom Date: header
git-send-email: do not pass custom Date: header

We already generate a Date: header based on when the patch was
emailed.  git-format-patch includes the Date: header of the
patch.  Having two Date: headers is just confusing, so we
just use the current Date:

Often the mailed patches in a patch series are created over a
series of several hours or days, so the Date: header from the
original commit is incorrect for email, and often far off enough
for spam filters to complain.

Signed-off-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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