Fix signed/unsigned promotion errors involving Emacs_Rectangle

Fix signed/unsigned promotion errors involving Emacs_Rectangle

* src/androidterm.c (android_note_mouse_movement):

* src/pgtkterm.c (note_mouse_movement):

* src/xdisp.c (get_glyph_string_clip_rects, remember_mouse_glyph)
(expose_area, expose_window, gui_intersect_rectangles): Cast
width or height fields in Emacs_Rectangles to int before summing
with or subtracting them from their coordinate fields, as they
are unsigned outside X, and the sign of the coordinates is thus
not preserved.

(cherry picked from commit e67e7185ce81e59c90741f92c2ba3209412f417e)