* "srcs" list contains one main Rust source file,
followed by optional dependent modules.
* A dependent module included in the "srcs" list is
the module name prefixed with ":".
* Add a simple test.
Bug: 160331255
Test: make and manual test build dependencies on genrule modules
Change-Id: I4f079138c2599158810b6412fce81b612a3f64a4