stop in cmake configure if we knew it can't be compiled

OTB and SuperBuild continues to build with an unsupported gcc/clang compiler and crash later.

There is a "cmake warning" printed on console but ain't right.

This Must be changed to "FATAL_ERROR" rather than "STATUS" ? The current code is simply wasting my screen real estate!

Also same thing in case of SuperBuild cmake configure (unsupported compiler should be out).

And..

If there is a special case where message type cannot be changed to FATAL_ERROR, that is debatable

Install centos7 on empty partition Boot into and build OTB with default gcc

Linux