main/musl: replace libiconv instead of conflict

libiconv exists and is empty. libiconv-dev exists and had empty
libiconv.a as compatibility wrapper, so we need to be able to
pull it in.

main/musl/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Timo Teräs <timo.teras@iki.fi>
 pkgname=musl
 pkgver=1.1.0
-pkgrel=3
+pkgrel=4
 pkgdesc="the musl c library (libc) implementation"
 url="http://www.musl-libc.org/"
 arch="all"
@@ -101,7 +101,8 @@ package() {
 }
 
 utils() {
-	depends="!uclibc-utils !libiconv"
+	depends="!uclibc-utils"
+	replaces="libiconv"
 	license="MIT BSD GPL2+"
 
 	mkdir -p "$subpkgdir"/usr/bin "$subpkgdir"/sbin