configure.in - tweak printf format guessing logic
configure.in - tweak printf format guessing logic

For Mac OS X, a pthread_t is really a pointer to a struct ...  need to
make the cpp post-processing smarter, and add a case to emit "p" (as
in %p) as the appropriate format when the unchained typedefs end up at
a pointer.

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