package/uboot-tools: concat files before passing to env image tool

Fix BR2_PACKAGE_HOST_UBOOT_TOOLS_ENVIMAGE_SOURCE so that files are actually concatenated
as described in the help text.

Signed-off-by: Mirza Kapetanovic <mirza.kapetanovic@gmail.com>
Reviewed-by: Matthew Weber <matthew.weber@collins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/uboot-tools/uboot-tools.mk

@@ -156,11 +156,12 @@ endif #BR_BUILDING
 
 define HOST_UBOOT_TOOLS_GENERATE_ENVIMAGE
 	$(HOST_UBOOT_TOOLS_GENERATE_ENV_DEFAULTS)
-	$(@D)/tools/mkenvimage -s $(BR2_PACKAGE_HOST_UBOOT_TOOLS_ENVIMAGE_SIZE) \
+	cat $(UBOOT_TOOLS_GENERATE_ENV_FILE) | \
+		$(@D)/tools/mkenvimage -s $(BR2_PACKAGE_HOST_UBOOT_TOOLS_ENVIMAGE_SIZE) \
 		$(if $(BR2_PACKAGE_HOST_UBOOT_TOOLS_ENVIMAGE_REDUNDANT),-r) \
 		$(if $(filter "BIG",$(BR2_ENDIAN)),-b) \
 		-o $(@D)/tools/uboot-env.bin \
-		$(UBOOT_TOOLS_GENERATE_ENV_FILE)
+		-
 endef
 define HOST_UBOOT_TOOLS_INSTALL_ENVIMAGE
 	$(INSTALL) -m 0755 -D $(@D)/tools/uboot-env.bin $(BINARIES_DIR)/uboot-env.bin