[source] uboot-lantiq: fix build issue

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/34ec245662766354ce0d19d586bb08f220ddb3b3

commit 34ec245662766354ce0d19d586bb08f220ddb3b3
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sun Jan 22 15:04:04 2017 +0100

    uboot-lantiq: fix build issue
    
    Do not reference BIN_DIR in the package install section directly, use
    $(1) instead.
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/boot/uboot-lantiq/Makefile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/package/boot/uboot-lantiq/Makefile b/package/boot/uboot-lantiq/Makefile
index cbebe91..401e77a 100644
--- a/package/boot/uboot-lantiq/Makefile
+++ b/package/boot/uboot-lantiq/Makefile
@@ -402,9 +402,10 @@ define Build/Compile
 endef
 
 define Package/uboot/install/default
+	$(INSTALL_DIR) $$(1)
 	$(CP) \
 		$(PKG_BUILD_DIR)/$(2) \
-		$(BIN_DIR)/uboot-$(BOARD)-$(1)/openwrt-$(BOARD)-$(1)-u-boot.img
+		$$(1)/openwrt-$(BOARD)-$(1)-u-boot.img
 endef
 
 define Package/uboot/install/uart
@@ -413,7 +414,7 @@ define Package/uboot/install/uart
 		> $(PKG_BUILD_DIR)/ddr_settings
 	perl $(PKG_BUILD_DIR)/tools/gct.pl \
 		$(PKG_BUILD_DIR)/ddr_settings $(PKG_BUILD_DIR)/u-boot.srec \
-		$(BIN_DIR)/uboot-$(BOARD)-$(1)/openwrt-$(BOARD)-$(1)-u-boot.asc
+		$$(1)/openwrt-$(BOARD)-$(1)-u-boot.asc
  endef
 
 define Package/uboot/install/template