build: use busybox gzip compatible force option
authorMathew McBride <matt@traverse.com.au>
Wed, 28 Mar 2018 02:34:52 +0000 (13:34 +1100)
committerJohn Crispin <john@phrozen.org>
Mon, 18 Jun 2018 19:31:30 +0000 (21:31 +0200)
commit97cb9d04eed0715f508f8dae91b56530f163adc3
treef915a3a34fa1088f7aceb2dcb48a79ab5ca817a8
parent8af649756f92d956a4c418bbd1817954cffa4ef5
build: use busybox gzip compatible force option

commit 138c763 ("build: add --force option to gzip in Build/gzip")
added the --force flag to the gzip invocation.

Under environments with busybox gzip (e.g Alpine Linux), this fails
as busybox only recognizes "-f".

Signed-off-by: Mathew McBride <matt@traverse.com.au>
(cherry picked from commit fba168f5745acac95db519a9984b62e3e508df6a)
include/image-commands.mk