WIP: mysql-connector-odbc: update from 3.x to 5.x (fixes build)

The new version uses the CMake build system.

FIXME:

$ LD_DEBUG=files isql -v mysql-test
[...]
      7813:     /nix/store/vhapcwmifih3fnx0pc6d85fcficjbvnd-mysql-connector-odbc-5.2.6/lib/libmyodbc5w.so: error: symbol lookup error: undefined symbol: my_thread_end_wait_time (fatal)
[...]
[01000][unixODBC][Driver Manager]Can't open lib '/nix/store/vhapcwmifih3fnx0pc6d85fcficjbvnd-mysql-connector-odbc-5.2.6/lib/libmyodbc5w.so' : file not found
[ISQL]ERROR: Could not SQLConnect