add support for vcxproj ExcludedFromBuild

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CMake generates a vcxproj file for the cppcheck GUI that has generated files for all configurations but adds ExcludedFromBuild so the files only gets compiled for a specific configuration.

<ClCompile Include="C:\Users\Bob\forks\cppcheck\build\gui\cppcheck-gui_autogen\mocs_compilation_Debug.cpp">
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='RelWithDebInfo|x64'">true</ExcludedFromBuild>
<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='MinSizeRel|x64'">true</ExcludedFromBuild>
</ClCompile>

This patch adds support for ExcludedFromBuild so a file only gets checked for a specific configuration.

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I found some existing code that does this. I'll try to use it.

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It will require major changes to use the existing code so I will close this for now.