Be more careful about X selection sizes

* src/xselect.c (selection_data_for_offset):
Offset is size_t, not long, since that’s what caller passes.
(selection_data_size): Truncate large selection sizes to a value
that is more likely to work without involving undefined behavior.
Do not exceed X_ULONG_MAX which is all X can handle, or
PTRDIFF_MAX which can confuse underlying code.
(x_start_selection_transfer): Invoke selection_data_size just once.

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