Added a flag to the rustdoc invocation

This CL adds the '-A renamed_and_removed_lints' argument to the rustdoc
invocation.  This will allow the compiler to be updated even when
libraries have not fixed all of the new warnings in their codebase.

Bug: 194899248
Test: m rustdoc
Change-Id: Ife9fd6dbd7223c9964a8117d60e8be878c8f7332
diff --git a/rust/builder.go b/rust/builder.go
index 523428d..6c44166 100644
--- a/rust/builder.go
+++ b/rust/builder.go
@@ -332,6 +332,9 @@
 	rustdocFlags = append(rustdocFlags, makeLibFlags(deps)...)
 	docTimestampFile := android.PathForModuleOut(ctx, "rustdoc.timestamp")
 
+	// Silence warnings about renamed lints
+	rustdocFlags = append(rustdocFlags, " -A renamed_and_removed_lints")
+
 	// Yes, the same out directory is used simultaneously by all rustdoc builds.
 	// This is what cargo does. The docs for individual crates get generated to
 	// a subdirectory named for the crate, and rustdoc synchronizes writes to