main/lua-md5: add lua 5.3 support and use intall_if

main/lua-md5/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
-_luaversions="5.1 5.2"
+_luaversions="5.1 5.2 5.3"
 pkgname="lua-md5"
 _name="md5"
 pkgver=1.2
-pkgrel=2
+pkgrel=3
 pkgdesc="Basic cryptographic facilities for Lua"
-url="http://www.keplerproject.org/md5/"
+url="https://github.com/keplerproject/md5"
 arch="all"
 license="MIT"
 depends=""
 makedepends=""
 subpackages=""
 for _i in $_luaversions; do
-	depends="$depends lua$_i-md5"
 	makedepends="$makedepends lua$_i-dev"
 	subpackages="$subpackages lua$_i-md5:split_${_i/./_}"
 done
@@ -48,7 +47,7 @@ package() {
 _split() {
 	local d= _ver=$1
 	pkgdesc="Basic cryptographic facilities for Lua $_ver"
-	replaces="$pkgname"
+	install_if="lua$_ver $pkgname=$pkgver-r$pkgrel"
 	depends=
 	for d in usr/lib/lua usr/share/lua; do
 		if [ -d "$pkgdir"/$d/$_ver ]; then