[PATCH] Makefile: Use sort shortopts

[Marek Vasut]

POSIX does not defined longopts for sort, use shortops
for even more compatibility.

Fixes: cc5a490cf465 ("Makefile: Sort u-boot-initial-env output")
Reported-by: Milan P. Stanić <mps at arvanta.net>
Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Christoph Niedermaier <cniedermaier at dh-electronics.com>
Cc: Marek Behún <marek.behun at nic.cz>
Cc: Simon Glass <sjg at chromium.org>
Cc: Stefano Babic <sbabic at denx.de>
Cc: u-boot at dh-electronics.com
Cc: u-boot at lists.denx.de
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 87f9fc786e8..5fc16b3b1f1 100644
--- a/Makefile
+++ b/Makefile
@@ -2444,7 +2444,7 @@ quiet_cmd_genenv = GENENV  $@
 cmd_genenv = \
 	$(objtree)/tools/printinitialenv | \
 	sed -e '/^\s*$$/d' | \
-	sort --field-separator='=' -k1,1 --stable -o $@
+	sort -t '=' -k 1,1 -s -o $@
 
 u-boot-initial-env: $(env_h) FORCE
 	$(Q)$(MAKE) $(build)=tools $(objtree)/tools/printinitialenv
-- 
2.40.1