fix windows compiler warnings (return size_t)
fix windows compiler warnings (return size_t)

dreamstreat/libkml,aaronblanchard/libkml,msmitherdc/libkml,sebastic/libkml,msmitherdc/libkml,dreamstreat/libkml,cboothe/libkml,libkml/libkml,rashadkm/libkml,aaronblanchard/libkml,Alwnikrotikz/libkml,giantchen2012/libkml,PiRSquared17/libkml,azzeddine1265/libkml,PiRSquared17/libkml,pombreda/libkml,pombreda/libkml,dreamstreat/libkml,libkml/libkml,dreamstreat/libkml,sebastic/libkml,sebastic/libkml,PiRSquared17/libkml,pombreda/libkml,flychen50/trunk,msmitherdc/libkml,azzeddine1265/libkml,aaronblanchard/libkml,Alwnikrotikz/libkml,cboothe/libkml,Alwnikrotikz/libkml,sebastic/libkml,msmitherdc/libkml,cboothe/libkml,msmitherdc/libkml,cboothe/libkml,msmitherdc/libkml,cboothe/libkml,aaronblanchard/libkml,sebastic/libkml,flychen50/trunk,giantchen2012/libkml,pombreda/libkml,flychen50/trunk,Alwnikrotikz/libkml,earthoutreach/libkml,PiRSquared17/libkml,flychen50/trunk,libkml/libkml,pombreda/libkml,giantchen2012/libkml,dreamstreat/libkml,msmitherdc/libkml,rashadkm/libkml,giantchen2012/libkml,earthoutreach/libkml,dreamstreat/libkml,dreamstreat/libkml,PiRSquared17/libkml,libkml/libkml,azzeddine1265/libkml,azzeddine1265/libkml,aaronblanchard/libkml,sebastic/libkml,azzeddine1265/libkml,PiRSquared17/libkml,cboothe/libkml,azzeddine1265/libkml,rashadkm/libkml,pombreda/libkml,cboothe/libkml,azzeddine1265/libkml,giantchen2012/libkml,pombreda/libkml,rashadkm/libkml,PiRSquared17/libkml,earthoutreach/libkml,libkml/libkml,Alwnikrotikz/libkml,rashadkm/libkml,flychen50/trunk,aaronblanchard/libkml,earthoutreach/libkml,pombreda/libkml,giantchen2012/libkml,dreamstreat/libkml,cboothe/libkml,flychen50/trunk,PiRSquared17/libkml,aaronblanchard/libkml,aaronblanchard/libkml,sebastic/libkml,msmitherdc/libkml,giantchen2012/libkml,flychen50/trunk,sebastic/libkml,flychen50/trunk,azzeddine1265/libkml,earthoutreach/libkml,giantchen2012/libkml