Currently gzip on host is used. If host gzip is provided by pigz, it fails to
redo install that pigz can't handle the option after file name. When run:

gzip src/backfire/backfire.4 -c > OUTPUT_FILE

File src/backfire/backfire.4 is zipped into backfire.4.gz but the OUTPUT_FILE
is empty. When rerun do_install, it shows warning:

| gzip: src/backfire/backfire.4 does not exist -- skipping

and empty manual gzip files are created:

$ file image/usr/share/man/man4/backfire.4.gz
image/usr/share/man/man4/backfire.4.gz: empty

Fix it by putting option '-c' before the file name.

Upstream-Status: Pending

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---
--- git/Makefile.orig	2014-11-14 15:47:26.406638419 +0800
+++ git/Makefile	2014-11-14 15:46:53.890637533 +0800
@@ -127,15 +127,15 @@
 	cp $(TARGETS) "$(DESTDIR)$(bindir)"
 	install -D -m 644 src/backfire/backfire.c "$(DESTDIR)$(srcdir)/backfire/backfire.c"
 	install -m 644 src/backfire/Makefile "$(DESTDIR)$(srcdir)/backfire/Makefile"
-	gzip src/backfire/backfire.4 -c >"$(DESTDIR)$(mandir)/man4/backfire.4.gz"
-	gzip src/cyclictest/cyclictest.8 -c >"$(DESTDIR)$(mandir)/man8/cyclictest.8.gz"
-	gzip src/pi_tests/pi_stress.8 -c >"$(DESTDIR)$(mandir)/man8/pi_stress.8.gz"
-	gzip src/ptsematest/ptsematest.8 -c >"$(DESTDIR)$(mandir)/man8/ptsematest.8.gz"
-	gzip src/sigwaittest/sigwaittest.8 -c >"$(DESTDIR)$(mandir)/man8/sigwaittest.8.gz"
-	gzip src/svsematest/svsematest.8 -c >"$(DESTDIR)$(mandir)/man8/svsematest.8.gz"
-	gzip src/pmqtest/pmqtest.8 -c >"$(DESTDIR)$(mandir)/man8/pmqtest.8.gz"
-	gzip src/backfire/sendme.8 -c >"$(DESTDIR)$(mandir)/man8/sendme.8.gz"
-	gzip src/hackbench/hackbench.8 -c >"$(DESTDIR)$(mandir)/man8/hackbench.8.gz"
+	gzip -c src/backfire/backfire.4 >"$(DESTDIR)$(mandir)/man4/backfire.4.gz"
+	gzip -c src/cyclictest/cyclictest.8 >"$(DESTDIR)$(mandir)/man8/cyclictest.8.gz"
+	gzip -c src/pi_tests/pi_stress.8 >"$(DESTDIR)$(mandir)/man8/pi_stress.8.gz"
+	gzip -c src/ptsematest/ptsematest.8 >"$(DESTDIR)$(mandir)/man8/ptsematest.8.gz"
+	gzip -c src/sigwaittest/sigwaittest.8 >"$(DESTDIR)$(mandir)/man8/sigwaittest.8.gz"
+	gzip -c src/svsematest/svsematest.8 >"$(DESTDIR)$(mandir)/man8/svsematest.8.gz"
+	gzip -c src/pmqtest/pmqtest.8 >"$(DESTDIR)$(mandir)/man8/pmqtest.8.gz"
+	gzip -c src/backfire/sendme.8 >"$(DESTDIR)$(mandir)/man8/sendme.8.gz"
+	gzip -c src/hackbench/hackbench.8 >"$(DESTDIR)$(mandir)/man8/hackbench.8.gz"
 
 .PHONY: install_hwlatdetect
 install_hwlatdetect: hwlatdetect