1. corrected HAVE_PW_GECOS detection in configure (which never worked)
2. added and documented wxGetFreeMemory() for Unix (Linux/Solaris only) git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6861 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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