main/libmpdclient: set meson buildtype to release

Default is debug :(

main/libmpdclient/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=libmpdclient
 pkgver=2.13
-pkgrel=0
+pkgrel=1
 pkgdesc="An asynchronous API library for interfacing MPD in the C, C++ & Objective C languages"
 url="https://www.musicpd.org/libs/libmpdclient"
 arch="all"
@@ -14,7 +14,13 @@ builddir="$srcdir/$pkgname-$pkgver"
 
 build() {
 	cd "$builddir"
-	meson --prefix=/usr . output
+	meson \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--localstatedir=/var \
+		--buildtype=release \
+		. output
 	ninja -C output
 }