- Turn off cmake's "transitive linking" for the share ndbclient library by
   using the LINK_INTERFACE_LIBARIES property. Previously anyone linking
   against shared ndbclient would also link against against the library which
   ndbclient was created from and thus resolve any unresolved depdendencies
   from those. That is no longer possible and causes a few link failures
   in our test* programs.
 - Add more references to ndbclient_exports.cpp to make more functions
   become exported from the shared ndbclient.
  - Note the number 37 passed to BitmaskImpl::setField, it has to be higher
   than 32 to avoid that BitmaskImpl::setFieldImpl() is optimized away in
   release compile.
 - Add more code to ndbclient_link_test.cpp to detect any missing symbols
   early.