- Fix errors created when string literals are frozen.

[git-p4: depot-paths = "//src/hoe/dev/": change = 14181]

lib/hoe/racc.rb

@@ -40,7 +40,7 @@ def initialize_racc
 
     # -v = verbose
     # -l = no-line-convert (they don't ever line up anyhow)
-    self.racc_flags ||= "-v -l"
+    self.racc_flags ||= +"-v -l"
     self.oedipus_options ||= {
                               :do_parse => false,
                              }