C #27: for $! forcing Errno save Config before

We need to load and save Config so that when we force Errno
the EGV for Errno::Config (and lateron DynaLoader::Config) is properly set.
(The imported alias)
This fixes now #27 run-time require again, in cases Errno or DynaLoader is
(remotely) involved.
C #27: also add Config for Tie::Hash::NamedCapture (dynaloaded >=5.14)

also remove B dependency for Internals::V, use __ANON__ instead.