Bump to xamarin/Java.Interop/master@c19794e6

[jonpryor]

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

• dotnet/java-interop@c19794e: [build] Support building with JetBrains OpenJDK 11 ([Xamarin.Android.Build.Task] Fix --max-res-version for android-O #629)
• dotnet/java-interop@6d7266d: [crc64] Change the hash prefix back to crc64 (Bump LibZipSharp to fix ZIP entry Unix permissions #628)
• dotnet/java-interop@7fe3a11: [crc64] Fix a subtle bug in CRC64 splice-by-8 implementation ([Xamarin.Android.Build.Tasks] Xamarin.Android "Clean" target does not remove old .mdb files for library projects after Xamarin 15.2 release (Mono 5.0), leading to out-of-date debugging symbols for Fast Deployment mode #627)
• dotnet/java-interop@9b88ce7: [performance] Improve speed of our CRC-64 hasher (Bump to mono/2017-04/1a227379 #624)
• dotnet/java-interop@1032c0e: [Java.Interop.Tools.Cecil] Change DirectoryAssemblyResolver Warning to Diagnostic Output (Bump to Java.Interop/master/4aa2cde3 #622)
• dotnet/java-interop@93df5a2: [generator] simplify life with 'var' in generated code (Bump to mono/2017-04/8d1f89f0 #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.

[jonpryor]

Duplicate of PR #4555.

[grendello]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[brendanzagaeski]

Draft release notes

Here are the notes I plan to include for this pull request:

### Build and deployment performance

  * [Java.Interop GitHub PR 624](https://github.com/xamarin/java.interop/pull/624),
    [Java.Interop GitHub PR 627](https://github.com/xamarin/java.interop/pull/627),
    [Java.Interop GitHub PR 628](https://github.com/xamarin/java.interop/pull/628):
    Update the CRC-64 algorithm used during builds to take advantage of a more
    efficient calculation technique.  This reduced the total incremental build
    time from about 8.7 second to about 8.5 seconds for a small Xamarin.Forms app
    when one line of a C# file was changed between builds.

### Issues fixed

#### Application and library build and deployment

  * [Java.Interop GitHub PR 622](https://github.com/xamarin/java.interop/pull/622):
    *warning : Failed to read ... with debugging symbols. Retrying to load it
    without it.* and *Mono.Cecil.Cil.SymbolsNotMatchingException: Symbols were
    found but are not matching the assembly* could appear during builds, for
    example for projects using obfuscation tools.  To align more closely with
    the behavior of other common .NET project types that do not warn about
    mismatched debugger symbols, Xamarin.Android projects now log these as
    informational messages instead of warnings.

To suggest any edits to this, feel free to reply in this PR, in the corresponding Java.Interop PRs, or add a Documentation/release-notes/4569.md file with the new suggestion. Thanks in advance!

I believe the last sentence of the Java.Interop GitHub PR 622 note about "other common .NET project types" is accurate and worth mentioning, but any comments or corrections are welcome. (See dotnet/java-interop#622 (comment) for additional context.)