clover: conditionally use MESA_GIT_SHA1
Considering how hard/annoying it was for many peoples' workflow to properly generate the macro, it will be demoted to conditionally available with follow-up commits. v2: Kill off gracious blank line (Vedran). Cc: mesa-stable@lists.freedesktop.org Cc: Vedran Miletić <vedran@miletic.net> Cc: Francisco Jerez <currojerez@riseup.net> Signed-off-by:Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (v1) Reviewed-by:
Vedran Miletić <vedran@miletic.net>