[gecode-users] CMake config improvements

[victor.zverovich at gmail.com]

Hello,

Please find attached a patch which implements the following changes to the
CMake build configuration:

* Set the output directory for runtime target files (executables and DLLs)
to bin/ subdirectory of the project's binary directory to avoid collisions
when Gecode is used as a subproject.

* Improve suppression of warnings.

* Add GECODE_USE_QT variable which specifies whether to use Qt. Qt is used
if GECODE_USE_QT is TRUE or unset.

* Prevent linker warnings on MSVC.

* Use per-target instead of global include directories. This simplifies use
of Gecode as a subproject because add_target_libraries(<target>
<gecode-lib>) now sets the necessary include directories for <target> in
addition to link dependencies.

* Fix by Tony Kelman to fully link internal dependencies needed for
creating DLLs: https://github.com/ampl/gecode/pull/2

Best regards,
Victor
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