uboot: don't override HOSTCC/HOSTLDFLAGS for kconfig

So the host ncurses includes and library are used instead of a mix of both,
causing corrupted characters.  Similar to the linux fix in commit
6d3d09e23213e8 (linux: don't override HOSTCC for kconfig), except that we
pass the linker flags in HOSTLDFLAGS.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 9255fd9fc7bb302fcb69282becea7273827c64e1)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/uboot/uboot.mk

@@ -211,7 +211,15 @@ endif # BR2_TARGET_UBOOT_USE_DEFCONFIG
 
 UBOOT_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES))
 UBOOT_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
-UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS)
+
+# UBOOT_MAKE_OPTS overrides HOSTCC / HOSTLDFLAGS to allow the build to
+# find our host-openssl. However, this triggers a bug in the kconfig
+# build script that causes it to build with /usr/include/ncurses.h
+# (which is typically wchar) but link with
+# $(HOST_DIR)/lib/libncurses.so (which is not).  We don't actually
+# need any host-package for kconfig, so remove the HOSTCC/HOSTLDFLAGS
+# override again.
+UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS) HOSTCC="$(HOSTCC)" HOSTLDFLAGS=""
 define UBOOT_HELP_CMDS
 	@echo '  uboot-menuconfig       - Run U-Boot menuconfig'
 	@echo '  uboot-savedefconfig    - Run U-Boot savedefconfig'