mgba: unbreak cross compilation (don't build -qt subpkg).

srcpkgs/mgba/template

@@ -6,7 +6,7 @@ build_style=cmake
 hostmakedepends="pkg-config"
 makedepends="libepoxy-devel ffmpeg-devel SDL2-devel MesaLib-devel zlib-devel
  libpng-devel libzip-devel libedit-devel libmagick-devel libzip-devel
- minizip-devel qt5-multimedia-devel"
+ minizip-devel"
 short_desc="Game Boy Advance emulator written in C"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="MPL-2"
@@ -14,6 +14,12 @@ homepage="https://ww.mgba.io/"
 distfiles="https://github.com/mgba-emu/${pkgname}/archive/${version}.tar.gz"
 checksum=0efcd1e4f8c8d34d0384919ea19fa625fa2585d35d102c00b31930196c1f49bc
 
+subpackages="libmgba"
+if [ -z "$CROSS_BUILD" ]; then
+	makedepends+=" qt5-multimedia-devel"
+	subpackages+=" mgba-qt"
+fi
+
 libmgba_package() {
 	short_desc+=" - shared library"
 	pkg_install() {