Remove a glibc test.

Change-Id: I58b6fbc70086a286e41a2b166e6ed8afe6237185
Remove old libstdc++ tests.

We have the libc++ tests now.

Change-Id: I68dba2286e67142e5dd4fd69feaeedd16da882c4
Merge "Remove old libstdc++ tests."
Merge "Remove a glibc test."