media-sound/sndio: Make it multilib

This is needed to add sndio support to multilib packages like portaudio

Signed-off-by: Haelwenn (lanodan) Monnier <contact@hacktivis.me>

media-sound/sndio/sndio-1.6.0.ebuild

@@ -3,6 +3,8 @@
 
 EAPI=7
 
+inherit multilib-minimal
+
 DESCRIPTION="small audio and MIDI framework part of the OpenBSD project"
 HOMEPAGE="http://www.sndio.org/"
 SRC_URI="http://www.sndio.org/${P}.tar.gz"
@@ -12,15 +14,20 @@ KEYWORDS="~amd64"
 IUSE="alsa"
 
 DEPEND="
-	dev-libs/libbsd
-	media-libs/alsa-lib
+	dev-libs/libbsd[${MULTILIB_USEDEP}]
+	media-libs/alsa-lib[${MULTILIB_USEDEP}]
 "
 RDEPEND="
 	${DEPEND}
 	acct-user/sndiod
 "
 
-src_configure() {
+src_prepare() {
+	default
+	multilib_copy_sources
+}
+
+multilib_src_configure() {
 	./configure \
 		--prefix=/usr \
 		--libdir=/usr/$(get_libdir) \