[mysql] fix incompatible character encodings: ASCII-8BIT and UTF-8

... triggered with Rails 4.1 (master)

Author: kares

lib/arjdbc/mysql/adapter.rb

@@ -152,8 +152,8 @@ def quote(value, column = nil)
       return value if sql_literal?(value)
       return value.to_s if column && column.type == :primary_key
 
-      if value.kind_of?(String) && column && column.type == :binary && column.class.respond_to?(:string_to_binary)
-        "x'#{column.class.string_to_binary(value).unpack("H*")[0]}'"
+      if value.kind_of?(String) && column && column.type == :binary
+        "x'#{value.unpack("H*")[0]}'"
       elsif value.kind_of?(BigDecimal)
         value.to_s("F")
       else