uboot-tools: force host CFLAGS
U-Boot now adds -std=gnu11 when building its build utilities, like
fixdep. This option is only supported since gcc version 4.7.
https://gcc.gnu.org/gcc-4.7/changes.html
Force usage of Buildroot HOST_CFLAGS, like we do already for
host-uboot-tools, to avoid the -std=gnu11 option.
Fixes:
http://autobuild.buildroot.net/results/ea0/ea09b614a3c10d494939d9551c0c3bfca4626ece/
http://autobuild.buildroot.net/results/f8e/f8efd9af4d86c51fe4f5afe44db9abf9adc5718f/
http://autobuild.buildroot.net/results/c0a/c0ab35c3cb46f84863fe20c0ee92ecc2379578b6/
Cc: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 03a808a0999ac031a1e93000d9a3c50ffbcb64a4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Baruch Siach