Revert "busybox: no alias to /etc/sv/ntpd."

This reverts commit 5e0409afbe.

xtraeme explained that it's a bad idea due to various base packages.

srcpkgs/busybox/template

@@ -1,7 +1,7 @@
 # Build template for 'busybox'.
 pkgname=busybox
 version=1.24.2
-revision=2
+revision=4
 hostmakedepends="perl"
 short_desc="The Swiss Army Knife of Embedded Linux"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
@@ -15,6 +15,7 @@ alternatives="
  hostname:hostname:/usr/bin/busybox
  sh:sh:/usr/bin/busybox
  ntpd:ntpd:/usr/bin/busybox
+ ntpd:ntpd:/etc/sv/busybox-ntpd
  vi:vi:/usr/bin/busybox"
 
 _cflags() {