ports/86293: lang/gauche includes gdbm by default

[Takehito Sasaki]

According to the gauche author, there might be license concern regarding
binary distribution of gdbm.  So that, he mention it may be safer to
distribute gauche-gdbm separately.

If that's the case, this problem report becomes fix request of
gauche-gdbm-0.8.5 which is broken if lang/gauche is upgreaded to 0.8.5_1.

best regards,
-- Takehito Sasaki