ANDROID: Only warn on long symbols

Rust symbols frequently exceed the maximum length for a MODVERSIONS
symbol. If this happens, warn and continue rather than erroring out.
This is intended to support testing of the Rust binder driver as a GKI
module.

This change is Android-only because we are pursuing a more complete
strategy upstream, but this is suitable for a GKI-module trial of the
Rust binder driver:

https://lore.kernel.org/rust-for-linux/20240617175818.58219-17-samitolvanen@google.com/T/#t



Bug: 347787665
Change-Id: I5f802760c9060a9b44e1a9e0d6e51e6f278888be
Signed-off-by: Matthew Maurer <mmaurer@google.com>