Even if we don't want to have a bloated stl implementation, having empty
files around is probably not very good either.
Added a test to make sure the header file compiles on host and kila-eng.
QA Impact: In system/extras/test/bionic/libstdc++ build the tests using:
mm BIONIC_TESTS=1
to build the host and target tests.
Original author: niko
Merged from: //branches/donutburger/...
Automated import of CL 143632
