Unable to build with colcon

[evshary]

Required information

Operating system:
Ubuntu 18.04 LTS

Compiler version:
GCC 7.5.0

Observed result or behaviour:
Unable to build colcon build with the following steps: https://github.com/eclipse/iceoryx/blob/master/doc/installation-guide.md#build-with-colcon

Expected result or behaviour:
Able to build successfully.

The error message is like that:

--- stderr: example_icedelivery_on_c
CMake Error at CMakeLists.txt:8 (find_package):
  Could not find a package configuration file provided by "iceoryx_binding_c"
  with any of the following names:

    iceoryx_binding_cConfig.cmake
    iceoryx_binding_c-config.cmake

  Add the installation prefix of "iceoryx_binding_c" to CMAKE_PREFIX_PATH or
  set "iceoryx_binding_c_DIR" to a directory containing one of the above
  files.  If "iceoryx_binding_c" provides a separate development package or
  SDK, be sure it has been installed.

I think the root cause is the existence of COLCON_IGNORE in iceoryx_binding_c.
This will cause colcon ignore this package.
However, this package is used by example_icedelivery_on_c in iceoryx_examples.
IMHO, I think it's OK to remove the COLCON_IGNORE in iceoryx_binding_c.