$EMAIL is a last resort fallback, as it's system-wide.

$EMAIL is a last resort fallback, as it's system-wide.

$EMAIL is a system-wide setup that is used for many many many
applications. If the git user chose a specific user.email setup,
then _this_ should be honoured rather than $EMAIL.

[jc: cherry-picked ec563e8 from 'master']

Signed-off-by: Pierre Habouzit <redacted>
Signed-off-by: Junio C Hamano <redacted>