Another patch about OpenMp support for libpgf :

- M$ Visual C++ 2008 support well OpenMP. Do not limit OpenMP support to Visual C++ 2010.
- use dedicated OpenMP detection define everywhere if OpenMP will be used with libpgf implementation.

Raphael, now, digiKam+libpgf compile fine with M$ Visual C++. Please include this patch into official and current libpgf repository. Thanks in advance.

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