Fix to build ps2_mouse with both LUFA and PJRC

- change API of ps2_mouse; ps2_mouse_task()
- remove mouse_report from host.c

common/mousekey.c

@@ -26,6 +26,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 
+static report_mouse_t mouse_report = {};
 static uint8_t mousekey_repeat =  0;
 static uint8_t mousekey_accel = 0;