[Buildroot] [PATCH 1/1] boot/uboot: Set MAKE_ENV for kconfig build system

[Thomas Preston]

U-Boot fails to build in gitlab CI context because the kconfig-package
build stage is unable to find bison for flex even though they are
installed in BR_BINARIES_DIR.

To fix this, set UBOOT_MAKE_ENV so that UBOOT_KCONFIG_MAKE uses the
correct PATH.

Signed-off-by: Thomas Preston <thomas.preston at codethink.co.uk>
---
 boot/uboot/uboot.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/boot/uboot/uboot.mk b/boot/uboot/uboot.mk
index bddafe234d..36428e65fe 100644
--- a/boot/uboot/uboot.mk
+++ b/boot/uboot/uboot.mk
@@ -449,6 +449,9 @@ endif # BR2_TARGET_UBOOT && BR_BUILDING
 ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY),y)
 $(eval $(generic-package))
 else ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG),y)
+UBOOT_MAKE_ENV = \
+	$(TARGET_MAKE_ENV) \
+	BR_BINARIES_DIR=$(BINARIES_DIR)
 UBOOT_KCONFIG_DEPENDENCIES = \
 	$(BR2_BISON_HOST_DEPENDENCY) \
 	$(BR2_FLEX_HOST_DEPENDENCY)
-- 
2.11.0