On 64 bit, only create new thread stack if started from 32 bit process on affected platforms

        * dcrt0.cc (dll_crt0_0): On 64 bit, set wow64_needs_stack_adjustment
        if not started from a 64 bit process.
        (_dll_crt0): Enable wow64_needs_stack_adjustment branch on 64 bit
        as well.  Remove 64 bit only code.  Introduce CREATE_STACK and
        FIX_STACK macros to conditionalize the code.  Rearrange and
        partially rewrite comments.
        * wincap.h (wincaps::has_3264_stack_broken): New element.
        * wincap.cc: Implement above element throughout.
        (wincapc::init): Set has_3264_stack_broken to false on 32 bit.
        * wow64.cc: Enable functionality on 64 bit architecture, except for
        wow64_revert_to_original_stack.  Enhance comments to explain.
        (wow64_eval_expected_main_stack): Make 64 bit clean.
        (wow64_test_for_64bit_parent): Ditto.
        * wow64.h: Export wow64_revert_to_original_stack on 32 bit only,
        everything else on all architectures.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

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