build: use busybox gzip compatible force option
commit138c763
("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 commitfba168f574
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@ -135,7 +135,7 @@ define Build/lzma-no-dict
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endef
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define Build/gzip
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gzip --force -9n -c $@ $(1) > $@.new
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gzip -f -9n -c $@ $(1) > $@.new
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@mv $@.new $@
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endef
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