Rely on the -I or -system compiler option to find "gtest/gtest.h". This
makes it easier to build our tests against a copy of gtest outside the
libvpx source tree.
Bug: webm:42330726
Change-Id: I3b189c6345e13b36b236d1eedc6ee091bfa71f48
For 1 layer CBR only.
Support for temporal layers comes later.
Rename the library to libvpxrc
Bug: b/188853141
Change-Id: Ib7f977b64c05b1a0596870cb7f8e6768cb483850