elfutils: Add mirrors.kernel.org as mirrror

Add mirrors.kernel.org as mirror, listed on sourceware mirror sites
page.

Link: https://sourceware.org/mirrors.html
Signed-off-by: Ryan Keane <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16886
Signed-off-by: Robert Marko <[email protected]>

package/libs/elfutils/Makefile

@@ -11,7 +11,8 @@ PKG_VERSION:=0.192
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
-PKG_SOURCE_URL:=https://sourceware.org/$(PKG_NAME)/ftp/$(PKG_VERSION)
+PKG_SOURCE_URL:=https://sourceware.org/$(PKG_NAME)/ftp/$(PKG_VERSION) \
+                https://mirrors.kernel.org/sourceware/$(PKG_NAME)/$(PKG_VERSION)
 PKG_HASH:=616099beae24aba11f9b63d86ca6cc8d566d968b802391334c91df54eab416b4
 
 PKG_MAINTAINER:=Luiz Angelo Daros de Luca <[email protected]>