Bump to xamarin/Java.Interop/master@c19794e6

Changes: dotnet/java-interop@80b4667...c19794e

  * dotnet/java-interop@c19794e: [build] Support building with JetBrains OpenJDK 11 (#629)
  * dotnet/java-interop@6d7266d: [crc64] Change the hash prefix back to `crc64` (#628)
  * dotnet/java-interop@7fe3a11: [crc64] Fix a subtle bug in CRC64 splice-by-8 implementation (#627)
  * dotnet/java-interop@9b88ce7: [performance] Improve speed of our CRC-64 hasher (#624)
  * dotnet/java-interop@1032c0e: [Java.Interop.Tools.Cecil] Change DirectoryAssemblyResolver Warning to Diagnostic Output (#622)
  * dotnet/java-interop@93df5a2: [generator] simplify life with 'var' in generated code  (#621)

Various `.csproj` files updated to deal with changes from
dotnet/java-interop@9b88ce79, which added a new `Crc64.Table.cs` file
and requires use of C# unsafe code.

Author: jonpryor

external/Java.Interop

@@ -89,6 +89,9 @@
     <Compile Include="..\..\external\Java.Interop\src\Java.Interop.Tools.JavaCallableWrappers\Java.Interop.Tools.JavaCallableWrappers\Crc64.cs">
       <Link>Crc64.cs</Link>
     </Compile>
+    <Compile Include="..\..\external\Java.Interop\src\Java.Interop.Tools.JavaCallableWrappers\Java.Interop.Tools.JavaCallableWrappers\Crc64.Table.cs">
+      <Link>Crc64.Table.cs</Link>
+    </Compile>
     <Compile Include="Android.Runtime\DynamicMethodNameCounter.cs" />
     <Compile Include="Android.Runtime\IJavaObjectValueMarshaler.cs" />
   </ItemGroup>

src/Mono.Android/Mono.Android.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <LibZipSharpBundleAllNativeLibraries>true</LibZipSharpBundleAllNativeLibraries>
     <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
   <Import Project="..\..\Configuration.props" />
@@ -24,6 +25,9 @@
     <Compile Include="..\..\external\Java.Interop\src\Java.Interop.Tools.JavaCallableWrappers\Java.Interop.Tools.JavaCallableWrappers\Crc64.cs">
       <Link>Crc64.cs</Link>
     </Compile>
+    <Compile Include="..\..\external\Java.Interop\src\Java.Interop.Tools.JavaCallableWrappers\Java.Interop.Tools.JavaCallableWrappers\Crc64.Table.cs">
+      <Link>Crc64.Table.cs</Link>
+    </Compile>
   </ItemGroup>
 
   <ItemGroup>