Update git to 2.11.0

Add compile methods
Correct dependencies

packages/git.rb

 require 'package'
 
 class Git < Package
-  version '1.8.4'
-  binary_url ({
-    aarch64: 'https://dl.dropboxusercontent.com/s/lnz5hmjv48d14f2/git-1.8.4-chromeos-armv7l.tar.xz',
-    armv7l:  'https://dl.dropboxusercontent.com/s/lnz5hmjv48d14f2/git-1.8.4-chromeos-armv7l.tar.xz',
-    i686:    'https://dl.dropboxusercontent.com/s/g3binxopw5nfky1/git-1.8.4-chromeos-i686.tar.gz?token_hash=AAEWnMNBfozSIzLD1unbYGJzT4FGkEfJmLFQ-3uzydfT_A&dl=1',
-    x86_64:  'https://dl.dropboxusercontent.com/s/i7vs9wfk94tsrzt/git-1.8.4-chromeos-x86_64.tar.gz?token_hash=AAHyvjayN7THoxlryZaxQ2Ejm9xyD6bZCqXZM81hYRC8iQ&dl=1',
-  })
-  binary_sha1 ({
-    aarch64: '084a3b9bb90c572e7c5b12aae485715f145053e5',
-    armv7l:  '084a3b9bb90c572e7c5b12aae485715f145053e5',
-    i686:    '8c1bf4bcffb0e9c17bf20dd05981e86ea34d5d65',
-    x86_64:  '067cb6c36616ac30999ab97e85f3dc0e9d1d57f4',
-  })
+  version '2.11.0'
+  source_url 'https://github.com/git/git/archive/v2.11.0.tar.gz'
+  source_sha1 'ca1187843b7dd2bb3b1c5e275f04c17fa70e7100'
 
-  depends_on 'zlibpkg'
+  # use system zlibpkg, openssl, curl, expat
+  depends_on 'zlibpkg' => :build
   depends_on 'libssh2'
-  depends_on 'perl'
-  depends_on 'curl'
-  depends_on 'expat'
-  depends_on 'gettext'
-  depends_on 'python'
+  depends_on 'openssl' => :build
+  depends_on 'curl' => :build
+  depends_on 'expat' => :build
+  depends_on 'gettext' => :build
+  depends_on 'perl' => :build
+  depends_on 'python27' => :build     # requires python2
+
+  def self.build
+    # need to build using single core
+    system "make", "-j1", "prefix=/usr/local", "CC=gcc", "PERL_PATH=perl", "PYTHON_PATH=python2", "all"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "prefix=/usr/local", "CC=gcc", "PERL_PATH=perl", "PYTHON_PATH=python2", "install"
+  end
 end