Blackist a few double-defined event names

BTN_LEFT should resolve to that, not BTN_MOUSE. Same goes for others.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Replace INCLUDES with AM_CPPFLAGS

src/Makefile.am:18: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS'
(or '*_CPPFLAGS')

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>