modify generated variadic macros so that they can be used with c++. cast temp arrays...

modify generated variadic macros so that they can be used with c++. cast temp arrays to constant so they persist for the lifetime of the reference. reorder the code slightly so we can determine if it is variadic when needed. clean up const usage to prevent duplicate const. check for function names which trigger falsepositives in the variadic support detection.

git-svn-id: https://svn.aros.org/svn/aros/trunk/AROS@49964 fb15a70f-31f2-0310-bbcc-cdcc74a49acc