Configure script won't crash without Fortran compiler, only a warning

Until now, when a Fortran compiler didn't exist on the host operating
system, the configure script would crash with a warning. But some projects
may not need Fortran, so this is just an extra/annoying crash!

With this commit, it will still print the warning, but instead of a crash,
it will just sleep for some seconds, then continue. Later, when if a
software needs Fortran, it's building will crash, but atleast the user was
warned.

In the future, we should add a step to check on the necessary software and
see if Fortran is necessary for the project or not. The project
configuration should indeed crash if Fortran is necessary, but we should
tell the user that software XXXX needs Fortran so we can't continue without
a Fortran compiler.

Also, a small sentence ("Project's configuration will continue in XXXX
seconds.") was added after all the warnings that won't cause a crash, so
user's don't think its a crash.

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