fix: windows project imports (#359)

Switched to $(ReactNativeWindowsDir) variable instead of searching for the hard coded path, this unblocks our uses cases inside react-native-windows repo.

Author: Kai Guo

example/windows/AsyncStorageExample.sln

@@ -55,6 +55,7 @@ Global
 		..\..\node_modules\react-native-windows\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems*{da8b35b3-da00-4b02-bde6-6a397b3fd46b}*SharedItemsImports = 9
 		..\..\node_modules\react-native-windows\Chakra\Chakra.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
 		..\..\node_modules\react-native-windows\JSI\Shared\JSI.Shared.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
+		..\..\node_modules\react-native-windows\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
 		..\..\node_modules\react-native-windows\Mso\Mso.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
 		..\..\node_modules\react-native-windows\Shared\Shared.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
 	EndGlobalSection

example/windows/AsyncStorageExample/Bundle/.gitignore

@@ -63,9 +63,11 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
+  <PropertyGroup>
+    <ReactNativeWindowsDir Condition="'$(ReactNativeWindowsDir)' == ''">$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), 'node_modules\react-native-windows\package.json'))\node_modules\react-native-windows\</ReactNativeWindowsDir>
+  </PropertyGroup>
   <ImportGroup Label="Shared">
-    <Import Project="..\..\..\..\react-native-windows\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems" Label="Shared" Condition="Exists('..\..\..\..\react-native-windows\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems')" />
-    <Import Project="..\..\node_modules\react-native-windows\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems" Label="Shared" Condition="Exists('..\..\node_modules\react-native-windows\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems')" />
+    <Import Project="$(ReactNativeWindowsDir)\Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems" Label="Shared" />
   </ImportGroup>
   <ImportGroup Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
@@ -135,11 +137,7 @@
     <None Include="PropertySheet.props" />
   </ItemGroup>
   <ItemGroup>
-    <ProjectReference Include="..\..\..\..\react-native-windows\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj" Condition="Exists('..\..\..\..\react-native-windows\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj')">
-      <Project>{f7d32bd0-2749-483e-9a0d-1635ef7e3136}</Project>
-      <Private>false</Private>
-    </ProjectReference>
-    <ProjectReference Include="..\..\node_modules\react-native-windows\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj" Condition="Exists('..\..\node_modules\react-native-windows\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj')">
+    <ProjectReference Include="$(ReactNativeWindowsDir)\Microsoft.ReactNative\Microsoft.ReactNative.vcxproj">
       <Project>{f7d32bd0-2749-483e-9a0d-1635ef7e3136}</Project>
       <Private>false</Private>
     </ProjectReference>