initial import of libXi-1.7.6

initial import of libXi-1.7.1

initial import of libXi-1.4.3. important changes include:
XIGrabDevice() fixes
Fix XISelectEvents on 64 bits, strict alignement architectures
Allocate enough memory for raw events + extra data
Use Data, not Data32 in XIPassiveGrabDevice

initial import of libXi-1.3