Include 'gen_build.complete' from Gem

Resolves #100.

bin/ocra

@@ -655,6 +655,12 @@ EOF
         Ocra.msg "Detected gem #{spec.full_name} (#{include.join(', ')})"
 
         gem_root = Pathname(spec.gem_dir)
+        gem_extension = (gem_root / '..' / '..' / 'extensions').expand
+        if gem_extension.exist?
+          build_complete = gem_extension.find_all_files(/gem.build_complete/).select{|p| p.dirname.basename.to_s == spec.full_name}
+        else
+          build_complete = nil
+        end
         gem_root_files = nil
         files = []
 
@@ -673,6 +679,7 @@ EOF
           when :files
             gem_root_files ||= gem_root.find_all_files(//)
             files << gem_root_files.select { |path| path.relative_path_from(gem_root) !~ GEM_NON_FILE_RE }
+            files << build_complete if build_complete
           when :extras
             gem_root_files ||= gem_root.find_all_files(//)
             files << gem_root_files.select { |path| path.relative_path_from(gem_root) =~ GEM_EXTRA_RE }