u-boot.mk: add HOST_LDFLAGS to UBOOT_MAKE_FLAGS

This will make sure that the build system's
paths for linking are available.
This is needed mostly for linking with tools/libressl.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

include/u-boot.mk

@@ -43,7 +43,7 @@ TARGET_DEP = TARGET_$(BUILD_TARGET)$(if $(BUILD_SUBTARGET),_$(BUILD_SUBTARGET))
 UBOOT_MAKE_FLAGS = \
 	HOSTCC="$(HOSTCC)" \
 	HOSTCFLAGS="$(HOST_CFLAGS) $(HOST_CPPFLAGS)" \
-	HOSTLDFLAGS=""
+	HOSTLDFLAGS="$(HOST_LDFLAGS)"
 
 define Build/U-Boot/Target
   $(eval $(call U-Boot/Init,$(1)))