The ornamental design for pour spout fitment, as shown and described.
FIG. 1 is a top perspective view of a design for a pour spout fitment, according to the present invention;
FIG. 2 is a front elevational view of the design for the pour spout fitment of FIG. 1, according to the present invention; and,
FIG. 3 is a top plan view of the design for the pour spout fitment of FIG. 1, according to the present invention.
The broken lines in the figures showing other portions of a pour spout fitment depict environmental subject matter only and form no part of the claimed ornamental design.