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[cmake][bugfix] Trigger reconfiguration on meta ini change

Dominic Kempf requested to merge feature/cmake-reconfigure-on-metaini-changes into master

This is an extremely important for the meta ini format to be usable in practice. The technical solution is a hack, which is very elegant nevertheless. I found it on the cmake mailing list:

http://www.cmake.org/pipermail/cmake/2013-October/055987.html

It uses the semantics of configure_file, which do automatically trigger reconfiguration. For us reconfiguration involves reexpansion.

This fixxes #40 (closed).

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