rust_bindgen was not hermetic previously as it would pull in host
headers for device targets. This fixes that by using the same flags we
use when compiling with Clang. This also makes sure our rust_bindgen
headers are built as similar as possible to their respective
cc_libraries.
This also pulls in the bionic dependencies as well, which provide the
headers required for device targets.
Bug: 162007475
Test: device rust_bindgen deps file does not reference host headers.
Change-Id: I4efdf333e011a6c6d73a0345e5485823f166d17a
Add SourceProvider modules which provides a base interface for more
complex code generation usecases such as bindgen. Also adds the
rust_bindgen module type which calls bindgen to generate Rust FFI
bindings to C.
Bug: 159064919
Test: Local test module generates bindings.
Test: New Soong tests pass.
Change-Id: Ie31467bbbe423497666ad837cf5fe1acd1e76bd8
