If sdk jars(android_stubs_current, etc) are compiled using soong java
modules, we have to filter them when running Java build with Turbine.
TODO: provide more unit-tests.
Test: m clean && m -j32; go test java_test
Change-Id: Iad7c241b0e8b0ca760950733f513124b56c84564
Adds a java_system_modules module type that (when
EXPERIMENTAL_USE_OPENJDK9 is set to true) converts a list of
java library modules and prebuilt jars into system modules,
and plumbs the system modules through to the javac command
line.
Also exports the location of the system modules to make
variables, as well as the name of the default system module.
Test: TestClasspath in java_test.go, runs automatically as part of the build
Bug: 63986449
Change-Id: I27bd5d2010092422a27b69c91568e49010e02f40
