[CMake] 2.4.7 SetLang test failure on Tru64 UNIX 5.1

[Albert Chin]

The SetLang test fails on Tru64 UNIX because the C++ compiler invokes
the C compiler to build Tests/SetLang/bar.c. The C++ compiler can be
used if we force it with "-x cxx". How do I do this to get this test
to pass?

-- 
albert chin (china at thewrittenword.com)