[source] network/ipv6/6rd: drop Build/Prepare rule in favor of default one

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/8cf08b678357c25b29451f39863f6471aa517a5d

commit 8cf08b678357c25b29451f39863f6471aa517a5d
Author: Alexandru Ardelean <ardeleanalex at gmail.com>
AuthorDate: Thu Oct 6 09:24:31 2016 +0300

    network/ipv6/6rd: drop Build/Prepare rule in favor of default one
    
    Signed-off-by: Alexandru Ardelean <ardeleanalex at gmail.com>
---
 package/network/ipv6/6rd/Makefile | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/package/network/ipv6/6rd/Makefile b/package/network/ipv6/6rd/Makefile
index 04d607e..899c0f1 100644
--- a/package/network/ipv6/6rd/Makefile
+++ b/package/network/ipv6/6rd/Makefile
@@ -29,11 +29,6 @@ Refer to http://wiki.openwrt.org/doc/uci/network for
 configuration details.
 endef
 
-define Build/Prepare
-	mkdir -p $(PKG_BUILD_DIR)
-	$(CP) ./src/* $(PKG_BUILD_DIR)/
-endef
-
 define Build/Configure
 endef