tree a601024d70c1e74a2ec3a5abde9b67b7de77846d
parent 406f93ae48857e8483e1d8143077f45576fe9189
author Junio C Hamano <gitster@pobox.com> 1549568188 -0800
committer Junio C Hamano <gitster@pobox.com> 1549568188 -0800

ci: clear and mark MAKEFLAGS exported just once

Clearing it once upfront, and turning all the assignment into
appending, would future-proof the code even more, to prevent
mistakes the previous one fixed from happening again.

Also, mark the variable exported just once at the beginning.  There
is no point in marking it exported repeatedly.

Signed-off-by: Junio C Hamano <gitster@pobox.com>