Faster nextpow2 function.
Faster nextpow2 function.

svn path=/trunk/libavg/; revision=8261

scotty007/libavg,yyd01245/libavg,yyd01245/libavg,libavg/libavg,hoodie/libavg,libavg/libavg,th3infinity/libavg,th3infinity/libavg,hoodie/libavg,hoodie/libavg,libavg/libavg,scotty007/libavg,th3infinity/libavg,hoodie/libavg,th3infinity/libavg,scotty007/libavg,yyd01245/libavg,libavg/libavg,scotty007/libavg,yyd01245/libavg