Evas: Fix MMX mask function _op_copy_p_mas_dp_mmx()

This function does the following operation:
COPY pixel x mask --> dst

But it wasn't iterating over the source. So it was repeating
the value of the first pixel over and over again.

Is this even used anywhere? RGBA + alpha mask function!?

src/lib/evas/common/evas_op_copy/op_copy_pixel_mask_i386.c

@@ -24,7 +24,7 @@ _op_copy_p_mas_dp_mmx(DATA32 *s, DATA8 *m, DATA32 c EINA_UNUSED, DATA32 *d, int
 		MOV_R2P(mm1, *d, mm0)
 		break;
 	  }
-	m++;  d++;
+	m++;  s++;  d++;
      }
 }