Makefile.inc1: Make package timestamps reproducible by defaultHEADmain

Set package archive timestamps based on most recent source commit
timestamp (approach suggested by bapt).

I'd like to include git metadata in a file included in src tarballs, so
that the build is reproducible (including the hash shown in uname etc.)
outside of a git checkout.  There are still details to be sorted out to
do that, so this is an interim step to improve reproducibility.

Reviewed by:	bapt
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D49165

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