Reduce code duplication in _adodb_getmenu functions
Reduce code duplication in _adodb_getmenu functions

Create 2 new internal functions
- _adodb_getmenu_select() to print the SELECT tag, and
- _adodb_getmenu_option() to print the OPTION tags

and call them from _adodb_getmenu() / _adodb_getmenu_gp().

ipso/ADOdb,ipso/ADOdb