add signal_desktop prereqs (#5356)

* add signal_desktop prereqs

* Cleanup

* Update for 7.0.11-2

* Update util_macros.rb

* move to self.patch

packages/sccache.rb

@@ -0,0 +1,44 @@
+require 'package'
+
+class Sccache < Package
+  description 'Shared Compilation Cache'
+  homepage 'https://github.com/mozilla/sccache/'
+  @_ver = '0.2.15'
+  version @_ver
+  compatibility 'all'
+  source_url "https://github.com/mozilla/sccache/archive/v#{@_ver}.tar.gz"
+  source_sha256 '7dbe71012f9b0b57d8475de6b36a9a3b4802e44a135e886f32c5ad1b0eb506e0'
+
+  binary_url({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/sccache-0.2.15-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/sccache-0.2.15-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/sccache-0.2.15-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/sccache-0.2.15-chromeos-x86_64.tar.xz'
+  })
+  binary_sha256({
+    aarch64: '0c5c81c8fb17e91e420cd2ab261800d5640519956a40c3feb74469bee303ec4e',
+     armv7l: '0c5c81c8fb17e91e420cd2ab261800d5640519956a40c3feb74469bee303ec4e',
+       i686: '817d47a4b92fc15e60c3f1f920965b8d6adbb0913f635abcd31135bc3ff0cde3',
+     x86_64: 'abbede3efe1a1cdee32be218ec2b86781da6074a262d7c07ac23b247610b8262'
+  })
+
+  depends_on 'rust' => ':build'
+
+  def self.build
+    system "cargo fetch \
+      --manifest-path Cargo.toml"
+    system "cargo build \
+      --release \
+      --frozen \
+      --manifest-path Cargo.toml"
+  end
+
+  def self.install
+    system "cargo install \
+      --frozen \
+      --offline \
+      --no-track \
+      --path . \
+      --root #{CREW_DEST_PREFIX}"
+  end
+end