[boost] Boost thread doesn't compile on windows if UNICODE is defined

From: Krzysztof Kowalczyk (kkowalczyk_at_[hidden])
Date: 2007-05-23 19:48:52

in mutex.inl:

        if (HMODULE kernel_module = GetModuleHandle(TEXT("KERNEL32.DLL")))
            g_TryEnterCriticalSection =
reinterpret_cast<TryEnterCriticalSection_type>(GetProcAddress(kernel_module,
TEXT("TryEnterCriticalSection")));

The problem is that GetProcAddress() on windows only has ascii version
and takes lpcstr as the name of the function to lookup, so if you
define UNICODE to do windows unicode build, compiler complains that
you're trying to pass WCHAR* as char*.

A complication here is with wince, which is the opposite and only
takes WCHAR* as the name of the function so the correct code should
pass "TryEnterCriticalSection" on non-wince and
L"TryEnterCriticalSection" on wince.

It also means that successful windows unicode build of boost doesn't
seem to be part of release criteria.

-- krzysztof kowalczyk