add ninja build tool

component/ninja/buildout.cfg

+[buildout]
+parts +=
+  ninja
+
+[ninja-download]
+recipe = hexagonit.recipe.download
+ignore-existing = true
+version = v1.7.1
+url = https://github.com/ninja-build/ninja/archive/${:version}.tar.gz
+destination = ${buildout:parts-directory}
+path = ${buildout:parts-directory}/ninja-1.7.1
+
+[ninja]
+recipe = plone.recipe.command
+path = ${ninja-download:path}
+command = (cd ${:path} && ./configure.py --bootstrap)
+update-command = command
\ No newline at end of file