Nuget - Use PlatformTarget instead of CefSharpPlatformTarget for copy targets

CefSharpPlatformTarget isn't defined on initial load

Author: amaitland

NuGet/CefSharp.Common.targets

@@ -378,9 +378,12 @@
   The None/Content entries aren't picked up as the .targets file doesn't exist before the Nuget restore (only when using packages.config)
   As a workaround we manually copy the files using a series of Targets and private itemgroup/propertygroups. 
   Accessing the ItemGroups that exist in the .props files isn't possible, the Targets are handled differently by msbuild/VS2017/VS2019 (worked previous in VS2015)
-  so we duplicate the entries private to these tasks. Must be kept in sync with the .props files
+  so we duplicate the entries private to these tasks. Must be kept in sync with the .props files.
+  We cannot use any of the variables defined in this targets file as they won't have been loaded initially.
+  So we can only use PlatformTarget rather than CefSharpPlatformTarget, leaving the other CefSharp specific variables for now as
+  they can be user defined so will be loaded.
   -->
-  <Target Name="CefSharpCopyFilesAfterNugetRestore32" AfterTargets="Build" Condition="'$(NuGetProjectStyle)' != 'PackageReference' AND !Exists('$(TargetDir)$(CefSharpTargetDir)libcef.dll') AND '$(CefSharpBuildAction)' != 'NoAction' AND '$(CefSharpPlatformTarget)' == 'x86'">
+  <Target Name="CefSharpCopyFilesAfterNugetRestore32" AfterTargets="Build" Condition="'$(NuGetProjectStyle)' != 'PackageReference' AND !Exists('$(TargetDir)$(CefSharpTargetDir)libcef.dll') AND '$(CefSharpBuildAction)' != 'NoAction' AND '$(PlatformTarget)' == 'x86'">
     <PropertyGroup>
       <CefRedist32TargetDir Condition="'$(CefRedist32TargetDir)' == ''">$(TargetDir)$(CefSharpTargetDir)</CefRedist32TargetDir>
     </PropertyGroup>
@@ -398,7 +401,7 @@
     <Copy SourceFiles="@(_CefSharpCommonManagedDll)" DestinationFiles="@(_CefSharpCommonManagedDll->'$(CefRedist32TargetDir)\%(RecursiveDir)%(Filename)%(Extension)')" SkipUnchangedFiles="true" />
   </Target>
 
-  <Target Name="CefSharpCopyFilesAfterNugetRestore64" AfterTargets="Build" Condition="'$(NuGetProjectStyle)' != 'PackageReference' AND !Exists('$(TargetDir)$(CefSharpTargetDir)libcef.dll') AND '$(CefSharpBuildAction)' != 'NoAction' AND '$(CefSharpPlatformTarget)' == 'x64'">
+  <Target Name="CefSharpCopyFilesAfterNugetRestore64" AfterTargets="Build" Condition="'$(NuGetProjectStyle)' != 'PackageReference' AND !Exists('$(TargetDir)$(CefSharpTargetDir)libcef.dll') AND '$(CefSharpBuildAction)' != 'NoAction' AND '$(PlatformTarget)' == 'x64'">
     <PropertyGroup>
       <CefRedist64TargetDir Condition="'$(CefRedist64TargetDir)' == ''">$(TargetDir)$(CefSharpTargetDir)</CefRedist64TargetDir>
     </PropertyGroup>
@@ -417,7 +420,7 @@
     <Copy SourceFiles="@(_CefSharpCommonManagedDll)" DestinationFiles="@(_CefSharpCommonManagedDll->'$(CefRedist64TargetDir)\%(RecursiveDir)%(Filename)%(Extension)')" SkipUnchangedFiles="true" />
   </Target>
 
-  <Target Name="CefSharpCopyFilesAfterNugetRestoreAnyCPU" AfterTargets="Build" Condition="'$(NuGetProjectStyle)' != 'PackageReference' AND !Exists('$(TargetDir)$(CefSharpTargetDirAnyCpu32)libcef.dll') AND '$(CefSharpBuildAction)' != 'NoAction' AND '$(CefSharpPlatformTarget)' == 'AnyCPU'">
+  <Target Name="CefSharpCopyFilesAfterNugetRestoreAnyCPU" AfterTargets="Build" Condition="'$(NuGetProjectStyle)' != 'PackageReference' AND !Exists('$(TargetDir)$(CefSharpTargetDirAnyCpu32)libcef.dll') AND '$(CefSharpBuildAction)' != 'NoAction' AND '$(PlatformTarget)' == 'AnyCPU'">
     <PropertyGroup>
       <CefRedist32TargetDir Condition="'$(CefRedist32TargetDir)' == ''">$(TargetDir)$(CefSharpTargetDirAnyCpu32)</CefRedist32TargetDir>
       <CefRedist64TargetDir Condition="'$(CefRedist64TargetDir)' == ''">$(TargetDir)$(CefSharpTargetDirAnyCpu64)</CefRedist64TargetDir>