apache-archiva: fix audit problem.

Warning was: `Please set plist_options when using a formula-defined plist`.

Formula/apache-archiva.rb

@@ -22,6 +22,8 @@ class ApacheArchiva < Formula
     cp_r libexec/"conf", var/"archiva"
   end
 
+  plist_options :manual => "ARCHIVA_BASE=#{HOMEBREW_PREFIX}/var/archiva #{HOMEBREW_PREFIX}/opt/apache-archiva/bin/archiva console"
+
   def plist; <<-EOS.undent
     <?xml version="1.0" encoding="UTF-8"?>
     <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">