Allow bionic-unit-tests-glibc to be built again.

When we switched to 64 bit host build be default, we no longer build
the glibc unit tests. Fix that, and also set all host targets to build
multilib.

This change also changes the name of bionic-unit-tests-glibc to add
the suffix of 32 or 64 depending on the host type built.

Change-Id: Ife13f9d80f351750ff02825b086d44bb0c2df828
2 files changed