contrib: rebuild the Win32 CppUnit under Linux and fix the includes.

Apparently g++ 4.5.2 on native mingw32 inserts references to __Unwind_Resume
when exceptions are supported. This function is not present in the g++ 4.4
cross-compiler found in Debian, leading to linker errors when cross-
compiling. So we use the latter to build CppUnit itself.

Another problem arises with g++ 4.4, which is the incomplete stripping of
exceptions when -fno-exceptions is used. Since ExceptionTestCaseDecorator.h
has such code, we protect it with #ifdef __EXCEPTIONS in the meantime.

test/lol-bench.cpp

@@ -137,9 +137,6 @@ static void bench_half(int mode)
                 ph[i] = RandF(-2.0f, 2.0f);
             break;
         }
-#if defined __EXCEPTIONS
-#error lol
-#endif
 
         /* Copy float */
         timer.GetMs();