[openwrt/openwrt] uboot-imx: pico-pi-imx7d: fix wrong make flags overriding

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/64fb5ae67ab0840d3da75f101abc2af0aeed2365

commit 64fb5ae67ab0840d3da75f101abc2af0aeed2365
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Tue Jul 12 09:22:15 2022 +0200

    uboot-imx: pico-pi-imx7d: fix wrong make flags overriding
    
    Buidbots are currently choking on the following compile error:
    
     In file included from tools/aisimage.c:9:
     include/image.h:1133:12: fatal error: openssl/evp.h: No such file or directory
      #  include <openssl/evp.h>
                 ^~~~~~~~~~~~~~~
     compilation terminated.
    
    This is caused by a complete overriding of make flags which are provided
    correctly in `UBOOT_MAKE_FLAGS` variable, but currently overriden
    instead of extended. This then leads to the usage of build host include
    dirs, which are not available.
    
    Fix it by extending `UBOOT_MAKE_FLAGS` variable like it was done in
    commit 481339a04266 ("uboot-imx: fix wrong make flags overriding").
    
    Fixes: 7094e6550336 ("uboot-imx: add support for TechNexion PICO-PI-IMX7D")
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 package/boot/uboot-imx/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/boot/uboot-imx/Makefile b/package/boot/uboot-imx/Makefile
index c23e48732b..ade26db768 100644
--- a/package/boot/uboot-imx/Makefile
+++ b/package/boot/uboot-imx/Makefile
@@ -39,7 +39,7 @@ endef
 define U-Boot/pico-pi-imx7d
   NAME:=TechNexion PICO-PI-IMX7D
   UBOOT_IMAGE:=SPL u-boot-dtb.img
-  UBOOT_MAKE_FLAGS:=SPL u-boot-dtb.img
+  UBOOT_MAKE_FLAGS+=SPL u-boot-dtb.img
   BUILD_SUBTARGET:=cortexa7
   BUILD_DEVICES:=technexion_imx7d-pico-pi
 endef