Use non-variadic SUCCEED() and support more compilers

Hi Phil,

In merging Catch to Catch-VC6 I encountered usage of the variadic variant of the SUCCEED() macro.

Using the non-variadic variant would enlarge the set of compilers that can be used to test Catch(-VC6;)

For Catch-VC6 I did: MiscTests.cpp(344): s/SUCCEED()/SUCCEED("")/

cheers,
Martin