Added define for caddr_t to prevent future problems with broken X11R4 headers and _POSIX_SOURCE.  Not defined if sys/types.h goes ahead and typedef's it anyway, when it's not supposed to.
Added define for caddr_t to prevent future problems with broken X11R4
headers and _POSIX_SOURCE.  Not defined if sys/types.h goes ahead
and typedef's it anyway, when it's not supposed to.

svn path=/trunk/; revision=1199

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot