perl C bindings: add explicit cast for int->ptr conversion
perl C bindings: add explicit cast for int->ptr conversion

Avoids compiler warnings on some platforms where sizeof(int)
is not the same as sizeof(void *).

wuliming/pcp,wuliming/pcp,wuliming/pcp,andyvand/cygpcpfans,prasincs/pcp,adfernandes/pcp,adfernandes/pcp,tjanez/pcp,andyvand/cygpcpfans,adfernandes/pcp,edwardt/pcp,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,prasincs/pcp,edwardt/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,edwardt/pcp,wuliming/pcp,adfernandes/pcp,edwardt/pcp,edwardt/pcp,tjanez/pcp,adfernandes/pcp,edwardt/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,wuliming/pcp,wuliming/pcp,adfernandes/pcp,andyvand/cygpcpfans,tjanez/pcp,tjanez/pcp,aeg-aeg/pcpfans,prasincs/pcp,prasincs/pcp,prasincs/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,wuliming/pcp,tjanez/pcp,prasincs/pcp,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,aeg-aeg/pcpfans,prasincs/pcp,tjanez/pcp