Set HOSTCFLAGS as nil to make the nvramtool include the regex.h
in system. Otherwise it will include the regex.h in kconfig, which
will cause building error in FreeBSD.
Change-Id: I95292e23e1716da1260842be9597119a4e26c8ed
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/1500
Reviewed-by: Anton Kochkov <anton.kochkov@gmail.com>
Tested-by: build bot (Jenkins)