PKGBUILD: depend on resolvconf instead of on openresolv

Depend on the interface, not on the implementation.
Nevertheless, for netctl, openresolv is the preferred implementation.

contrib/PKGBUILD.in

@@ -7,7 +7,7 @@ pkgdesc='Profile based systemd network management'
 url='http://projects.archlinux.org/netctl.git/'
 license=('GPL')
 groups=('base')
-depends=('coreutils' 'iproute2' 'openresolv' 'systemd>=233')
+depends=('coreutils' 'iproute2' 'resolvconf' 'systemd>=233')
 # The source tarball includes pre-built (using asciidoc) documentation.
 makedepends=('pkg-config')
 optdepends=('dialog: for the menu based wifi assistant'