lib: Make bt_value_null a const pointer
We probably don't want anything to change the value of this pointer,
which points to the only instance of BT_VALUE_TYPE_NULL,
bt_value_null_instance. Therefore, declare it as a constant value.
It also helps a little bit the Python bindings: if we copy the
declaration verbatim to the .i file, without const, bt_value_null is
available through the special "cvar" global object (and can be
modified!). With const, it becomes read-only, so can be accessed
directly as native_bt.value_null.
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
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