[boost] [type_traits] is_base_and_derived on Borland 5.8.1

Hi, is_base_and_derived isn't working on Borland 5.8.1, as you can see if you compare the test results for 5.8.1 (http://tinyurl.com/nru5r) and 5.6.4 (http://tinyurl.com/mh4s9). The attached patch might fix it. Please, could someone with access to the compiler try it out? thanks, Daniel