The ornamental design for a gamingmachinecabinet, as shown and described.
FIG. 1 is a front elevational view of a first embodiment of a gaming machine cabinet showing the new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left elevational view thereof;
FIG. 4 is a right elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken line showing of portions of the gaming machine cabinet is included for the purpose of illustrating environmental structure and forms no part of the claimed design.