Bug 13751 – WaitForMultipleObjects's first argument not use on x86_64

if you compile the dfl Library to 64 bit,you will find error: core.sys.windows.windows.WaitForMultipleObjects(uint nCount,void** lpHandles,....) is not callable using argument types(ulong,void**,...) the 'WaitForMultipleObjects' Function is in dmd2/src/druntime/src/core/sys/windows/windows.d the argument of first is dfl's value ,it come from a 'length' ,it's type is size_t,now it is 'ulong' on 64 bit. So druntime must keep the same as phobos for size_t.

WaitForMultipleObjects is a Win32 API function. If you look at the documentation for it [1], the first parameter is a DWORD, which is always defined as a 32-bit integer on both 32-bit and 64-bit Windows. The prototype in DRuntime cannot change this. The problem here is with DFL, not DRuntime. The fix is to cast the .length parameter to a DWORD when making the function call.

[1] http://msdn.microsoft.com/en-us/library/windows/desktop/ms687025(v=vs.85).aspx