libbinder_ndk: AIBinder_setInheritRt

Pipe through this option to libbinder_ndk. This was originally a HIDL
feature, enabled by default there. It was ported to libbinder, and it is
now exposed here.

Fixes: 209338827
Test: libbinder_ndk_unit_test (this test is also in VTS, so is
    binderLibTest which has a function test of this API)
Change-Id: I0dde73654b37a414b9267a857a958d19de79bc9d