Various configure and build enhancements:
- Auto detect availability of wxWidgets, disable or enable examples build accordingly
- Enhacend (cross) toolchain detection and prefix. Now compile win32 target on linux host (--cc=i686-mingw32-gcc)

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Authors :

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Edouard TISSERANT (www.lolitech.fr)

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Francis DUPIN (LIVIC)

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Laurent BESSARD (www.lolitech.fr)

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