USES_CONVERSION is used in once.cpp

[vividos]

The file libs/thread/src/once.cpp uses the ATL macros
USES_CONVERSION and A2CW when the macro
BOOST_NO_ANSI_APIS is defined (it's the case when
compiling for Windows CE). This leads to compiler
errors, since the needed header <atlconv.h> is not
included anywhere.

One possible fix would be to put the following in the file:

#ifdef BOOST_NO_ANSI_APIS
#include <atlbase.h>
#include <atlconv.h> // for USES_CONVERSION and A2CW
#endif

(atlconv.h needs atlbase.h)

Another possible fix would be to change the way to
convert the string used in the call to CreateMutexW().

[Anthony Williams]

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Fixed on HEAD