patch for Visual Studio 8 + Windows x64 (AMD64)

[lsh123]

This patch adds "vc8" build tool to jam and fixes several issues with building boost in Visual Studio 8 on AMD64 platform:

* tools/build/jam_src/build.bat

On Windows 64 the default location for Visual Studio is "C:\Program Files (x86)\...". The ( ) confuses the bat file big time and I had to workaround it by using quotes and DeQuote function.

* tools/build/jam_src/build.jam and tools/build/jam_src/jambase.c

Simply new "vc8" tool

* tools/build/jam_src/pathunix.c

Changed DWORD -> int because on VC8 DWORD is unsigned which causes problem when we have pos=0 (then prev_pos is a huge number and everything is screwed).

* boost/config/abi/msvc_prefix.hpp

Make alignment consistent with STLPort.

* boost/config/abi/msvc_prefix.hpp

It seems that this workaround is not needed in the final version of VC 8

* libs/thread/src/once.cpp

This is a known issue (http://lists.boost.org/boost-users/2005/09/13765.php). Unfortunately, I can't figure out a better way to fix this.

[lsh123]

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forgot to add that the patch is done against boost 1_33_1

[René Rivera]

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Boost.Jam in CVS already has many fixes to support both cross x64 and native x64 building. As for the rest, I would suggest posting separate library specific patches.

[René Rivera]

AFAICT all the changes are either already done by now, or the code in question has been rewritten.