[Bug 4370] terragen no longer runs with wine

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=4370

------- Additional Comments From [e-mail]  2006-17-03 09:23 -------
I wonder if the correct solution might be using a bitwise and as a mask instead
of equality checking - if the value being tested is VT_VARIANT|VT_BYREF than it
wouldn't ever be equal to VT_VARIANT.

The following fixed the error for my case :

if (rgvt[i] & VT_VARIANT)
    	        VariantCopy(&rgvarg[i], src_arg);
                    else if ((rgvt[i] & VT_BYREF) && !V_ISBYREF(src_arg))
                    ...