Upgrade gauche to version 0.9.3.2 and remove the unrecognized
`--disable-debug` flag. Gauche will build against gdbm-1.10
if it is installed, usually as a dep of Python, but it's optional.
Gauche builds just fine without it.
ClosesHomebrew/homebrew#12218.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>