package: busybox: update download link

There is no file named busybox-1.36.1.tar.bz2 in the root directory of the website
The actual download link is “https://sources.buildroot.net/busybox/busybox-1.36.1.tar.bz2”

Signed-off-by: Jack Sun <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16719
Signed-off-by: Robert Marko <[email protected]>

package/utils/busybox/Makefile

@@ -11,7 +11,7 @@ PKG_FLAGS:=essential
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=https://www.busybox.net/downloads \
-		http://sources.buildroot.net
+		https://sources.buildroot.net/$(PKG_NAME)
 PKG_HASH:=b8cc24c9574d809e7279c3be349795c5d5ceb6fdf19ca709f80cde50e47de314
 
 PKG_BUILD_DEPENDS:=BUSYBOX_CONFIG_PAM:libpam