ab214331 (Makefile: stop pretending to support rpmbuild, 2016-04-04)
dropped support for rpmbuild using our own specfile by removing
git.spec.in, but forgot to remove the dependency of the dist target
on git.spec.
Signed-off-by: Dennis Kaarsemaker <dennis@kaarsemaker.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>