testing/opam: move from unmaintained and take maintainer

unmaintained/opam/APKBUILD → testing/opam/APKBUILD

 # Contributor: Michael Zuo <muh.muhten@gmail.com>
-# Maintainer: Michael Zuo <muh.muhten@gmail.com>
+# Maintainer: Anil Madhavapeddy <anil@recoil.org>
 pkgname=opam
 pkgver=1.2.2
 pkgrel=0
 pkgdesc="OCaml Package Manager"
-url="http://opam.ocaml.org"
+url="https://opam.ocaml.org"
 arch="all"
 license="LGPL3"
-depends=""
-depends_dev="ocaml"
+depends="ocaml camlp4 curl tar unzip rsync aspcud"
 makedepends="$depends_dev"
 install=""
 subpackages=""
 source="https://github.com/ocaml/$pkgname/releases/download/$pkgver/$pkgname-full-$pkgver.tar.gz"
-
-_builddir="$srcdir"/$pkgname-full-$pkgver
-prepare() {
-	local i
-	cd "$_builddir"
-	for i in $source; do
-		case $i in
-		*.patch) msg $i; patch -p1 -i "$srcdir"/$i || return 1;;
-		esac
-	done
-}
+builddir="$srcdir"/$pkgname-full-$pkgver
 
 build() {
-	cd "$_builddir"
+	cd "$builddir"
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
@@ -40,7 +29,7 @@ build() {
 }
 
 package() {
-	cd "$_builddir"
+	cd "$builddir"
 	make DESTDIR="$pkgdir" install || return 1
 }