Add --disable-static-c++-tests option [BZ #31797]

By default, if the C++ toolchain lacks support for static linking,
configure fails to find the C++ header files and the glibc build fails.
The --disable-static-c++-link-check option allows the glibc build to
finish, but static C++ tests will fail if the C++ toolchain doesn't
have the necessary static C++ libraries which may not be easily installed.
Add --disable-static-c++-tests option to skip the static C++ link check
and tests.  This fixes BZ #31797.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>