Add kcov package (#3139)

* Add kcov package

* Fixing dependency for kcov package

packages/kcov.rb

+require 'package'
+
+class Kcov < Package
+  description 'Kcov is a code coverage tester for compiled programs, Python scripts and shell scripts.'
+  homepage 'http://simonkagstrom.github.io/kcov/'
+  version 'v36'
+  source_url 'https://github.com/SimonKagstrom/kcov/archive/v36.tar.gz'
+  source_sha256 '29ccdde3bd44f14e0d7c88d709e1e5ff9b448e735538ae45ee08b73c19a2ea0b'
+
+  depends_on 'curl'
+  depends_on 'elfutils'
+
+  def self.build
+    Dir.mkdir 'build'
+    Dir.chdir 'build' do
+      system 'cmake',
+             '-DCMAKE_BUILD_TYPE=Release',
+             "-DCMAKE_INSTALL_PREFIX=#{CREW_PREFIX}",
+             '..'
+      system 'make'
+    end
+  end
+
+  def self.install
+    Dir.chdir 'build' do
+      system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+    end
+  end
+
+end