Tony Lownds: [ Patch #101816 ] Fixes shared modules on Mac OS X

    1. Mac OS X is recognized by the Next-ish host recognition code as
    "Darwin/1.2"

    2. When specifying just --with-dyld, modules can compile as shared

    3. --with-dyld and --with-next-framework, modules can compile as
    shared

    4. --with-suffix=.exe, and Lib/plat-darwin1.2 is being made, the regen
    script invokes python as python.exe

    [I had to reformat this patch a bit to make it work.  Please test!]

Dan Wolfe: [ Patch #101823 ] Fix Darwin POSIX Thread redefinition

    The patch below fixes the redefinition problem in Darwin with
    _POSIX_THREADS. I'm not sure if this is the correct long term fix but
    for now it fixes the problem and the fix is specific to Darwin.

Dan Wolfe: [ Patch #101824 ] On Darwin, remove unrecognized option
                             `-OPT:Olimit=0'

  After many, many, many compiles, I finally got itchy of this warning
  cluttering up the output... so I scratched (Darwin configs only) and
  it's gone! :-)