Add libtest to our list of stdlib libraries, and remove some others that
are only used when generating proc_macros (which aren't dynamic).
Bug: 141207434
Test: m -j crosvm.experimental
Change-Id: I39cb030940adf1993e861d0142378eeea8b1ff5e
Adds support to Soong for building rust modules. This currently only
supports x86_64 device and x86 linux host targets. The functionality
is sufficient to build crosvm.
Bug: 136189233
Test: Test module builds.
Test: crosvm builds.
Change-Id: I6ea04615834a6d673578ab10ea1a2eb04259fe09