Remove unused PKGBUILD file

dist/unix/PKGBUILD.in

@@ -1,56 +0,0 @@
-# Maintainer: Jonas Kvinge <jonas@jkvinge.net>
-pkgname=strawberry
-pkgver=@STRAWBERRY_VERSION_PAC_V@
-pkgrel=@STRAWBERRY_VERSION_PAC_R@
-pkgdesc="A music player aimed at audio enthusiasts and music collectors"
-arch=(x86_64)
-url="https://www.strawberrymusicplayer.org/"
-license=(GPL3)
-makedepends=(git cmake make gcc boost gettext qt5-tools)
-depends=(
-  desktop-file-utils
-  hicolor-icon-theme
-  gnutls
-  udisks2
-  protobuf
-  qt5-base
-  qt5-x11extras
-  sqlite3
-  alsa-lib
-  libpulse
-  dbus
-  taglib
-  gstreamer
-  gst-plugins-base
-  gst-plugins-good
-  vlc
-  chromaprint
-  libgpod
-  libcdio
-  libmtp
-  fftw
-)
-optdepends=(
-  gst-plugins-bad
-  gst-plugins-ugly
-  gst-libav
-)
-provides=(strawberry)
-conflicts=(strawberry)
-source=("strawberry-@STRAWBERRY_VERSION_PACKAGE@.tar.xz")
-sha256sums=('SKIP')
-
-prepare() {
-  mkdir -p build
-}
-
-build() {
-  cd build
-  cmake ../${pkgname}-@STRAWBERRY_VERSION_PACKAGE@ -DCMAKE_INSTALL_PREFIX=/usr
-  make -j$(nproc)
-}
-
-package() {
-  cd build
-  make DESTDIR="${pkgdir}" install
-}