building.md: Add note for static builds and bindings
building.md: Add note for static builds and bindings

Closes #864

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

malikabhi05/mraa,stefan-andritoiu/mraa,alext-mkrs/mraa,alext-mkrs/mraa,Propanu/mraa,arfoll/mraa,malikabhi05/mraa,stefan-andritoiu/mraa,stefan-andritoiu/mraa,Propanu/mraa,yongli3/mraa,Propanu/mraa,malikabhi05/mraa,yongli3/mraa,Propanu/mraa,yongli3/mraa,g-vidal/mraa,KurtE/mraa,intel-iot-devkit/mraa,stefan-andritoiu/mraa,arfoll/mraa,Propanu/mraa,KurtE/mraa,arfoll/mraa,intel-iot-devkit/mraa,malikabhi05/mraa,stefan-andritoiu/mraa,alext-mkrs/mraa,alext-mkrs/mraa,g-vidal/mraa,g-vidal/mraa,alext-mkrs/mraa,intel-iot-devkit/mraa,yongli3/mraa,arfoll/mraa,arfoll/mraa,g-vidal/mraa,yongli3/mraa,g-vidal/mraa,intel-iot-devkit/mraa,intel-iot-devkit/mraa,KurtE/mraa,KurtE/mraa,malikabhi05/mraa,KurtE/mraa