Some Mac libraries have symbols which are many thousands of characters long.
(Thank you, C++ templates!)  It doesn't seem worth it to accommodate those by
dynamically allocating the symbol name buffer, but we definitely don't want to
assert.  Just log an ERR.
Signed-off-by: Ken Thomases <ken@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>