Don't let "tar" manage compression

It may end up calling "zcat", which is not allowed in the building
sandbox. As "gzip" is present int prebuilts, just change the command to
use "gzip" separately.

Conflicts:
	wl/Android.mk
diff --git a/wl/Android.mk b/wl/Android.mk
index cd4d739..3c165ee 100644
--- a/wl/Android.mk
+++ b/wl/Android.mk
@@ -42,7 +42,7 @@
 	$(hide) mkdir -p $(@D) && /usr/bin/curl -k https://docs.broadcom.com/docs-and-downloads/docs/linux_sta/$(@F) > $@
 
 $(WL_LIB): $(WL_SRC) $(addprefix $(LOCAL_PATH)/,$(WL_PATCHES))
-	$(hide) tar zxf $< -C $(@D) --overwrite -m && \
+	$(hide) gzip -d -c $< | tar xf - -C $(@D) --overwrite -m && \
 		rm -rf $@ && mv $(@D)/lib $@ && touch $@ && \
 		cat $(filter %.patch,$^) | patch -p1 -d $(@D)