tinyxml2 2.0.2 (new formula)

tinyxml2 is a light-weight c++ library for parsing xml. It
was previously submitted as a head-only formula in Homebrew/homebrew#23381
but was put on hold until releases could be tagged upstream.
The 2.0.2 release has just been tagged.

tinyxml2: add test that uses pkg-config to search for library

tinyxml2: add basic test for compiling and linking

Update tinyxml2.rb

Remove pkg-config test.

Formula/tinyxml2.rb

@@ -0,0 +1,26 @@
+require "formula"
+
+class Tinyxml2 < Formula
+  homepage "http://grinninglizard.com/tinyxml2"
+  url "https://github.com/leethomason/tinyxml2/archive/2.0.2.tar.gz"
+  sha1 "c78a4de58540e2a35f4775fd3e577299ebd15117"
+  head "https://github.com/leethomason/tinyxml2.git", :branch => "master"
+
+  depends_on "cmake" => :build
+
+  def install
+    system "cmake", ".", *std_cmake_args
+    system "make", "install"
+  end
+
+  test do
+    (testpath/'test.cpp').write <<-EOS.undent
+      #include <tinyxml2.h>
+      int main() {
+        tinyxml2::XMLDocument doc (false);
+        return 0;
+      }
+    EOS
+    system ENV.cc, "test.cpp", "-ltinyxml2"
+  end
+end