msmtp: Fix to work with autoconf 2.70
Add the required gettext version macro to work with the new autoconf
version.
Signed-off-by: 
Richard Purdie <richard.purdie@linuxfoundation.org>
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Add the required gettext version macro to work with the new autoconf
version.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>