Changes that enable ncc-1.6 to be compiled on
Mac OS X (with 2002-Nov Developer Tools installed)

commented out include of alloca.h
made sure that stdlib.h was included
in      ccexpr.C
        dbstree.C
        preproc.C
        space.C

move include of sys/types.h prior to mman.h
in      preproc.C
        main.C


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On Sun OS

added include of alloca.h
to      cdb.C
        nccnav/nccnav.C