Restructure autoconf configure.ac

This patch attempts to cleanly seperate configure switches,
dependency checking and generating of output files inside
the autoconf configure.ac file.

Also, instead of aborting immediately if a dependency is missing,
the configure script now completes dependency checking and then
lists ALL dependencies that are missing for the selected build
options. In addtion, suggestions on how to disable some features
that require the missing dependencies are printed out.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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