Update UtestPlatform.cpp
Update UtestPlatform.cpp

Adjusting PlatformSpecificVSNprintf to use a BorlandVSNprintf fuctions that adds the final '\0'  to the last element of the buffer.
cpputest/cpputest,basvodde/cpputest,offa/cpputest,cpputest/cpputest,basvodde/cpputest,offa/cpputest,cpputest/cpputest,offa/cpputest,basvodde/cpputest,basvodde/cpputest,cpputest/cpputest,offa/cpputest