evas: Fix sign mismatch in evas between.c and .h definitions

evas: Fix sign mismatch in evas between.c and .h definitions

Summary:
Parameters w and h are declared as int for evas_common_rgba_image_from_data
and evas_common_rgba_image_from_copied_data in evas_image_data.c.  This
does not match the prototypes in evas_image_private.h which declares them
unsigned.

Original report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748026

Reviewers: jpeg

Reviewed By: jpeg

Subscribers: cedric, jpeg

Differential Revision: https://phab.enlightenment.org/D5540