community/clutter-gtk: add docbook-xsl-nons to makedepends

Fix rebuild failure due to missing non-namepsaced version of `docbook-xsl`
for xsl parsing by explicitly including the `-nons` subpackage.

Ref: #16579

community/clutter-gtk/APKBUILD

@@ -6,7 +6,8 @@ pkgdesc="Gtk clutter embed library"
 url="https://wiki.gnome.org/Projects/Clutter"
 arch="all"
 license="LGPL-2.0-or-later"
-makedepends="gtk+3.0-dev gtk-doc clutter-dev libxslt libxml2-utils itstool gobject-introspection-dev meson"
+makedepends="gtk+3.0-dev gtk-doc clutter-dev docbook-xsl-nons libxslt
+	libxml2-utils itstool gobject-introspection-dev meson"
 subpackages="$pkgname-dev $pkgname-doc $pkgname-lang"
 source="https://download.gnome.org/sources/clutter-gtk/${pkgver%.*}/clutter-gtk-$pkgver.tar.xz"