Sofia-SIP 1.12 API passes size in int or unsigned int in numerous places.
Now use typedes isize_t (used instead of int), usize_t (used instead of
unsigned) and issize_t (used instead of int when returning signed size).

With --disable-size-compat, make API to use size_t or ssize_t instead of
int/unsigned int.

win32/sofia-sip/su_configure.h: define suitable values for isize_t, usize_t
and issize_t.

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