[kaffe] config/config-mem.h

[Kiyo Inaba]

Hi tim,

The story for supporting old linux reminds me one more problem for them.

In 'config/config-mem.h', there is a external definition for 'swab'
and it uses 'ssize_t' type for its argument. Unfortunately (again)
this is not defined in old linux (ala 2.2.5), and everytime I replace
ssize_t to size_t. Some person kindly leave original in comment, so
it's a simple matter to move comment...

But, I hope this can also be tested by configure.

Kiyo