Adding vm.lv2 0.4.0 from AUR.

PKGBUILD

+# Maintainer: David Runge <dave@sleepmap.de>
+pkgname=vm.lv2
+pkgver=0.4.0
+pkgrel=3
+pkgdesc="A virtual machine LV2 plugin bundle"
+arch=('x86_64')
+url="https://open-music-kontrollers.ch/lv2/vm/#"
+license=('Artistic2.0')
+groups=('lv2-plugins' 'pro-audio')
+depends=('libgl')
+makedepends=('cmake' 'lv2')
+source=("https://git.open-music-kontrollers.ch/lv2//$pkgname/snapshot/$pkgname-$pkgver.tar.xz")
+md5sums=('01614eb27309f4fbd0dde02dc74991c0')
+
+prepare() {
+  cd "$pkgname-$pkgver"
+  mkdir -v build
+}
+
+build() {
+  cd "$pkgname-$pkgver/build"
+  cmake -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_INSTALL_PREFIX=/usr \
+        ..
+  make
+}
+
+package() {
+  cd "$pkgname-$pkgver/build"
+  make DESTDIR="$pkgdir/" install
+  # docs
+  install -vDm 644 ../README.md "${pkgdir}/usr/share/doc/${pkgname}/README.md"
+}