Patch Mir PKGBUILD for 2.28

PKGBUILD.diff

diff --git a/PKGBUILD.orig b/PKGBUILD
index 4c972fb..6dcfc46 100644
--- a/PKGBUILD.orig
+++ b/PKGBUILD
@@ -4,9 +4,8 @@
 # Contributor: Bjoern Franke <bjo+aur<at>schafweide.org>
 # Contributor: Ivan Semkin (ivan at semkin dot ru)
 # Contributor: kikadf <kikadf.01@gmail.com>
-
 pkgname=mir
-pkgver=2.23.0
+pkgver=2.28.0
 pkgrel=1
 pkgdesc="Canonical's display server"
 url="https://github.com/canonical/mir"
@@ -20,6 +19,7 @@ depends=(apparmor boost-libs libglvnd lttng-ust libepoxy libxml++2.6 libinput ya
          bash systemd-libs libdisplay-info pixman
 )
 makedepends=(glm doxygen graphviz cmake ninja boost umockdev wlcs glmark2
+             rust
              python-pillow python-dbus
              #gcovr lcov valgrind
              python-dbusmock
@@ -31,13 +31,22 @@ optdepends=('qterminal: required for miral demos'
             'xcursor-dmz: opt requirement for miral demos')
 options=()
 source=("https://github.com/canonical/mir/releases/download/v${pkgver}/mir-${pkgver}.tar.xz")
-sha256sums=('01c088b037f19c69d40c33514be15dd124411ce385af55d3772cfed5fe18d3eb')
+sha256sums=('6b457b133f98cc4f56da45dc7716a8a4d4841288e670db57e743e6a3d4187b31')
 
 # glm doesnt ship with a glm.pc, but mir build falls back on cmake's find_package for non-debian systems
 
+prepare() {
+  cd "${pkgname}-${pkgver}"
+
+  export CARGO_HOME="${srcdir}/cargo-home"
+  cargo fetch --locked
+}
+
 build() {
   export CFLAGS+=" -ffat-lto-objects -O2"
   export CXXFLAGS+=" -ffat-lto-objects -O2"
+  export CARGO_HOME="${srcdir}/cargo-home"
+  export CARGO_NET_OFFLINE=true
 
   local _flags=(
     -B build 
@@ -66,4 +75,3 @@ build() {
 package() {
   DESTDIR="${pkgdir}" cmake --install build
 }
-