Win32 configuration filter matches Win64 as well

This passes (added to core\modules\vstudio\tests\vc2010\test_files.lua):

	function suite.excludedFromBuild_onConfigExcludedFile()
		configurations { "Debug", "Release" }
		platforms { "Win64", "Win32" }

		files { "hello.cpp" }
		configuration "Win64"
		removefiles { "hello.cpp" }

		prj = test.getproject(wks, 1)
		vc2010.files(prj)
		test.capture [[
<ItemGroup>
	<ClCompile Include="hello.cpp">
		<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug Win64|x64'">true</ExcludedFromBuild>
		<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release Win64|x64'">true</ExcludedFromBuild>
	</ClCompile>
</ItemGroup>
		]]
	End

However, if it's filtered for Win32, then hello.cpp is removed for both configs (generated block is empty). So, this fails:

	function suite.excludedFromBuild_onConfigExcludedFile()
		configurations { "Debug", "Release" }
		platforms { "Win64", "Win32" }

		files { "hello.cpp" }
		configuration "Win32"
		removefiles { "hello.cpp" }

		prj = test.getproject(wks, 1)
		vc2010.files(prj)
		test.capture [[
<ItemGroup>
	<ClCompile Include="hello.cpp">
		<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug Win32|x64'">true</ExcludedFromBuild>
		<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release Win32|x64'">true</ExcludedFromBuild>
	</ClCompile>
</ItemGroup>
		]]
	End

If however Win32 is substituted for, say, "Win33" (in config declarations too), then it filters fine for that, and only "Win33" configs are excluded.

Start with core\modules\vstudio\tests\vc2010\test_files.lua and run the excludedFromBuild_onConfigExcludedFile cases through vc2010.files(prj). Compare the passing Win64 and Win33 captures with the failing Win32 capture; done means Win32 exclusions are emitted only for the matching Win32 configurations.