Kiwix-build should stop with a clear/user friendly message if a non-supported build is started

[kelson42]

See:

• Error building kiwix-android on ubuntu 16.04 #141
• macOS: error when build kiwix-tools natively #53
• arch linux: kiwix-serve.cpp:76:21: fatal error: ifaddrs.h: No such file or directory #332

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.

[mgautierfr]

If #487, we can see

ERROR: The target platform native_dyn cannot be build on host raspbian.
Select another target platform or change your host system.

We should add that it is kiwix-desktop that can be compile in platform native_dyn on rasbian, but it is pretty clear to me.
And it may be better to stop indeed.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.