sdk: switch base feed url to git.openwrt.org

As LEDE is rebranding to OpenWrt now, adjust the base feed Git reference
accordingly.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

target/sdk/Makefile

@@ -45,7 +45,7 @@ GIT_TAGNAME:=$(shell git show-ref --tags --dereference 2>/dev/null | sed -ne '/^
 BASE_FEED:=$(if $(GIT_URL),src-git base $(GIT_URL)$(if $(GIT_BRANCH),;$(GIT_BRANCH),$(if $(GIT_TAGNAME),;$(GIT_TAGNAME))))
 BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),$(shell cd $(TOPDIR); LC_ALL=C git svn info 2>/dev/null | sed -ne 's/^URL: /src-gitsvn base /p'))
 BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),$(shell cd $(TOPDIR); LC_ALL=C svn info 2>/dev/null | sed -ne 's/^URL: /src-svn base /p'))
-BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),src-git base https://git.lede-project.org/source.git$(if $(GIT_BRANCH),;$(GIT_BRANCH),$(if $(GIT_TAGNAME),;$(GIT_TAGNAME))))
+BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),src-git base https://git.openwrt.org/source.git$(if $(GIT_BRANCH),;$(GIT_BRANCH),$(if $(GIT_TAGNAME),;$(GIT_TAGNAME))))
 
 KDIR_BASE = $(patsubst $(TOPDIR)/%,%,$(LINUX_DIR))