This is done by implementing the HostToolPath interface for java
Binary objects.
Currently, in order for a java_binary_host to be used in this way the
java_host_binary must include:
compile_multilib: "first"
Otherwise the genrule is unable to find the correct variant.
Test: ./build_test.bash
Test: Manual
Bug: 68397812
Change-Id: I6849488dc13fa8c383df69d00f62ad815ec17876