Add ccache (#4818)

* Add cccache
* add bintray links
* add changing of path info line.
* rm zlibpkg from deps
* formatting fix

packages/ccache.rb

+require 'package'
+
+class Ccache < Package
+  description 'Compiler cache that speeds up recompilation by caching previous compilations'
+  homepage 'https://ccache.samba.org/'
+  version '4.1'
+  compatibility 'all'
+  source_url 'https://github.com/ccache/ccache/releases/download/v4.1/ccache-4.1.tar.xz'
+  source_sha256 '5fdc804056632d722a1182e15386696f0ea6c59cb4ab4d65a54f0b269ae86f99'
+
+  binary_url ({
+     aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/ccache-4.1-chromeos-armv7l.tar.xz',
+      armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/ccache-4.1-chromeos-armv7l.tar.xz',
+        i686: 'https://dl.bintray.com/chromebrew/chromebrew/ccache-4.1-chromeos-i686.tar.xz',
+      x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/ccache-4.1-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+     aarch64: '525bce425116fadb8ffaf352df87bde4f424380a1d4a98915d52de005aa0663d',
+      armv7l: '525bce425116fadb8ffaf352df87bde4f424380a1d4a98915d52de005aa0663d',
+        i686: '14ebe59db9eb33c86f867153bda9340fa5732a2ad19f48fe0e8900f238b43015',
+      x86_64: '5c4c9e014f23977f2f031eb9f9b367881a20fa8effeac9e38289cd723aa11e62',
+  })
+
+
+  depends_on 'asciidoc' => :build
+
+  def self.build
+    ENV['CFLAGS'] = '-flto'
+    ENV['CXXFLAGS'] = '-flto'
+    Dir.mkdir 'build'
+    Dir.chdir 'build' do
+      system "cmake -G Ninja \
+      #{CREW_CMAKE_OPTIONS} \
+      -DCMAKE_INSTALL_SYSCONFDIR=#{CREW_PREFIX}/etc \
+      -DZSTD_FROM_INTERNET=ON \
+      .."
+      system "ninja"
+    end
+  end
+  
+  def self.install
+    system "DESTDIR=#{CREW_DEST_DIR} ninja -C build install"
+    Dir.chdir 'build' do
+      FileUtils.mkdir_p "#{CREW_DEST_LIB_PREFIX}/ccache/bin"
+      system "for _prog in gcc g++ c++; do
+        ln -s #{CREW_PREFIX}/bin/ccache #{CREW_DEST_LIB_PREFIX}/ccache/bin/$_prog 
+        ln -s #{CREW_PREFIX}/bin/ccache #{CREW_DEST_LIB_PREFIX}/ccache/bin/${CHOST}-$_prog
+      done
+      for _prog in cc clang clang++; do
+        ln -s #{CREW_PREFIX}/bin/ccache #{CREW_DEST_LIB_PREFIX}/ccache/bin/$_prog
+      done"
+    end
+  end
+  
+  def self.postinstall
+    system "ccache --set-config=sloppiness=file_macro,locale,time_macros"
+    puts "To compile using ccache you need to add the ccache bin folder to your path".lightblue
+    puts "e.g.  put this in your ~/bashrc:".lightblue
+    puts "export PATH=#{CREW_LIB_PREFIX}/ccache/bin::#{CREW_PREFIX}/bin:/usr/bin:/bin".lightblue
+    # To modify a package use the following:
+    # ENV['PATH'] = "#{CREW_LIB_PREFIX}/ccache/bin:#{CREW_PREFIX}/bin:/usr/bin:/bin"
+  end
+end