package/x11r7/xdriver_xf86-video-mach64: don't override XDRIVER_XF86_VIDEO_MACH64_CONF_OPTS
XDRIVER_XF86_VIDEO_MACH64_CONF_OPTS is wrongly overridden in a
conditional since commit cf26ae7dd14f35dd917811f5a23c54a19ea6ed07
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>