tevent 0.9.21

add new formula for tevent 0.9.21

Closes Homebrew/homebrew#28541.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/tevent.rb

@@ -0,0 +1,20 @@
+require "formula"
+
+class Tevent < Formula
+  homepage "http://tevent.samba.org/"
+  url "http://www.samba.org/ftp/tevent/tevent-0.9.21.tar.gz"
+  sha1 "daa1a4f457773be2e0f645beede93db6943224a5"
+
+  depends_on "pkg-config" => :build
+  depends_on "talloc"
+
+  conflicts_with "samba", :because => "both install `include/tevent.h`"
+
+  def install
+    system "./configure", "--prefix=#{prefix}",
+                          "--disable-rpath",
+                          "--without-gettext",
+                          "--bundled-libraries=!talloc"
+    system "make install"
+  end
+end