Remove broken PKGBUILD

For a while now there is an Arch PKBGUILD in the AUR. The in-tree one is
broken and does not build.

With that the Arch handling in build.sh is no longer used, alas as
requested I've left it since it is "useful for quicker MangoHud
development" :-P

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

PKGBUILD

@@ -1,36 +0,0 @@
-pkgname=('mangohud' 'lib32-mangohud')
-pkgver=r24.b67a2aa
-pkgrel=1
-pkgdesc="Vulkan overlay layer to display information about the application"
-arch=('x86_64')
-makedepends=('gcc' 'meson' 'python-mako' 'libx11' 'lib32-libx11' 'git')
-depends=('glslang' 'libglvnd' 'lib32-libglvnd' 'vulkan-headers')
-replaces=('vulkan-mesa-layer-mango' 'lib32-vulkan-mesa-layer-mango')
-url="https://github.com/flightlessmango/MangoHud"
-
-pkgver() {
-    cd $startdir
-    printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
-}
-
-prepare() {
-  git submodule update --init --depth 50
-}
-
-build() {
-    cd $startdir
-    # ./build.sh clean
-    ./build.sh build
-}
-
-package_mangohud() {
-  provides=("mangohud=${pkgver}")
-  cd $startdir
-  install -Dm664 "build/release/usr/lib64/libMangoHud.so" "${pkgdir}/usr/lib/libMangoHud.so"
-  install -Dm664 "build/release/usr/share/vulkan/implicit_layer.d/mangohud.json" "${pkgdir}/usr/share/vulkan/implicit_layer.d/mangohud.json"
-}
-package_lib32-mangohud() {
-  provides=("lib32-mangohud=${pkgver}")
-  cd $startdir
-  install -Dm664 "build/release/usr/lib32/libMangoHud.so" "${pkgdir}/usr/lib32/libMangoHud.so"
-}