force test bitness (so runners are consistent)

Author: darrenkopp

LibSass.NET.Tests/LibSass.NET.Tests.csproj

@@ -22,6 +22,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
+    <PlatformTarget>x64</PlatformTarget>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -31,6 +32,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
+    <PlatformTarget>x64</PlatformTarget>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />