components: Add libuserhosts.

component/libuserhosts/buildout.cfg

+[buildout]
+extends =
+  ../git/buildout.cfg
+
+[libuserhosts]
+recipe = plone.recipe.command
+stop-on-error = true
+update-command = ${:command}
+command = cd ${libuserhosts-get:location} && make
+# For convenience (one section to build & know result path)
+location = ${libuserhosts-get:location}/libuserhosts.so
+
+[libuserhosts-get]
+recipe = slapos.recipe.build:gitclone
+repository = http://git.erp5.org/repos/userhosts.git
+revision = 0681899be173f0b71ca3ad6e154a34e70d92f48c
+git-executable = ${git:location}/bin/git
+location = ${buildout:parts-directory}/libuserhosts