added pango package and its dependecies

packages/cairo.rb

+require 'package'
+
+class Cairo < Package
+  version '1.14.8'
+  source_url 'https://www.cairographics.org/releases/cairo-1.14.8.tar.xz'
+  source_sha1 'c6f7b99986f93c9df78653c3e6a3b5043f65145e'
+
+  depends_on 'libpng'
+  depends_on 'pixman'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end

packages/harfbuzz.rb

+require 'package'
+
+class Harfbuzz < Package
+  version '1.1.5'
+  source_url 'https://www.freedesktop.org/software/harfbuzz/release/harfbuzz-1.4.5.tar.bz2'
+  source_sha1 'e979eb20b789c1fc47107ef93a584924e34dd195'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end

packages/pango.rb

+require 'package'
+
+class Pango < Package
+  version '1.40.0'
+  source_url 'https://ftp.gnome.org/pub/gnome/sources/pango/1.40/pango-1.40.0.tar.xz'
+  source_sha1 '5e1394f2c063747593cb8157ebd953103b8000d2'
+
+  depends_on 'freetype'
+  depends_on 'fontconfig'
+  depends_on 'harfbuzz'
+  depends_on 'cairo'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end

packages/pixman.rb

+require 'package'
+
+class Pixman < Package
+  version '0.34.0'
+  source_url 'https://www.cairographics.org/releases/pixman-0.34.0.tar.gz'
+  source_sha1 'a1b1683c1a55acce9d928fea1ab6ceb79142ddc7'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end