[dylan-lang/melange] 58f2c5: Handle size_t / ssize_t specially.

  Branch: refs/heads/handle-size-t-specially
  Home:   https://github.com/dylan-lang/melange
  Commit: 58f2c5e688b5ee9526055bb78ebfe42b985740c4
      https://github.com/dylan-lang/melange/commit/58f2c5e688b5ee9526055bb78ebfe42b985740c4
  Author: Bruce Mitchener <[email protected]>
  Date:   2014-12-15 (Mon, 15 Dec 2014)

  Changed paths:
    M melange-core/c-decl-state.dylan
    M melange-core/c-decl.dylan
    M melange-core/c-lexer.dylan
    M melange-core/c-parse.input
    M melange-core/library.dylan

  Log Message:
  -----------
  Handle size_t / ssize_t specially.

This makes it so that usages of size_t / ssize_t will get mapped
to the new C-FFI support for <C-size-t> and <C-ssize-t>.

Part of this patch treats size_t / ssize_t as new reserved words
that map to the correct pre-defined types. The other part adds
a special case to the typedef processing to skip any typedefs that
attempt to set the meaning of size_t / ssize_t, like this from the
OS X headers:

    typedef __darwin_size_t size_t;

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