build: use busybox gzip compatible force option
authorMathew McBride <matt@traverse.com.au>
Wed, 28 Mar 2018 02:34:52 +0000 (13:34 +1100)
committerHauke Mehrtens <hauke@hauke-m.de>
Mon, 21 May 2018 16:07:48 +0000 (18:07 +0200)
commitfba168f5745acac95db519a9984b62e3e508df6a
treeba26c42bd7f8e8b7d8d673acee780ee01658e14b
parent39e87e0ffc4eabf27d25459a369be425e9ef0474
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>
include/image-commands.mk