#213 Add 64 bit Windows support

[Bitwise]

Request for 64 bit Windows support. This has anecdotally been accomplished by several people outside the core support group. Here is an extract of a message from Benoit Lanthemann (see Bitwise for email address) who seems to have completed the task:

I have done a build using VS2010 for both x86 and x64. I had to make a minor change as explained below.

Details of build of latest generic cppunit:
I fetched this week a snapshot of cppunit stamped 1.12.2. It does build seamlessly using its own batch file and Win32.
I made a new BuildVS2010x64.bat file.
I added x64 configurations to the .sln, had to do these mods:
http://stackoverflow.com/questions/15003043/how-to-build-cppunit-with-visual-studio-2012

Just for info I had to do this change this, but it is not related to cppunit specifically:
(http://connect.microsoft.com/VisualStudio/feedback/details/499476/c-project-resource-compiler-fails-with-rc-fatal-error-rc1106-invalid-option-ologo) => workaround

Change this file: %LOCALAPPDATA%\Microsoft\MSBuild\v4.0\Microsoft.Cpp.x64.user.props
<ExecutablePath>C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bin;$(ExecutablePath)</ExecutablePath>
To
<ExecutablePath>>C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin;$(ExecutablePath)</ExecutablePath>

Change this file: %LOCALAPPDATA%\Microsoft\MSBuild\v4.0\Microsoft.Cpp.Ein32.user.props
<ExecutablePath>C:\Program Files (x86)\Microsoft SDKs\Windows\v6.0A\bin;$(ExecutablePath)</ExecutablePath>
To
<ExecutablePath>C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\bin;$(ExecutablePath)</ExecutablePath>