adapting to new setjmp/longjmp implementation

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>> Fix your application.
> 
> 
> Thanks for your help.

Yes, it is a pain, but at least it is fast and simple
(else you could complain because of performance degradation.)
Detect the glibc version, or look directly at the code at run time,
then compensate.

0x4c4a8ba0 <__longjmp>: mov    0x4(%esp),%eax
0x4c4a8ba4 <__longjmp+4>:       mov    0x14(%eax),%edx
0x4c4a8ba7 <__longjmp+7>:       mov    0x10(%eax),%ecx
0x4c4a8baa <__longjmp+10>:      xor    %gs:0x18,%edx
0x4c4a8bb1 <__longjmp+17>:      xor    %gs:0x18,%ecx
0x4c4a8bb8 <__longjmp+24>:      mov    (%eax),%ebx
0x4c4a8bba <__longjmp+26>:      mov    0x4(%eax),%esi
0x4c4a8bbd <__longjmp+29>:      mov    0x8(%eax),%edi
0x4c4a8bc0 <__longjmp+32>:      mov    0xc(%eax),%ebp
0x4c4a8bc3 <__longjmp+35>:      mov    0x8(%esp),%eax
0x4c4a8bc7 <__longjmp+39>:      mov    %ecx,%esp
0x4c4a8bc9 <__longjmp+41>:      jmp    *%edx

Then, petition the standards committee for the logical functionality
that you find useful.  Your long-standing usage will satisfy one of the
major check boxes in the process.

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