examples: Remove x11 based examples

These examples have not been ported. In addition, they are also not very
useful these days, as the demo application offers a much nicer view to
view images from a sensor.

examples/meson.build

@@ -17,13 +17,3 @@ executable('cpp-test',
              root_inc,
            ],
            c_args: common_cflags)
-
-# if get_option('x11-examples')
-#     executable('img_capture_continuous',
-#                'img_capture_continuous.c',
-#                dependencies: [ libfprint_dep, xv_dep, x11_dep ],
-#                include_directories: [
-#                  root_inc,
-#                ],
-#                c_args: common_cflags)
-# endif