[pkg-opensc-maint] Bug#979726: Patch approved upstream (until a more complete one is cooked)

[Eric Valette]

 From the https://github.com/OpenSC/OpenSC/issues/2199 discussion, the 
root cause has been identified, a one liner fix has been proposed 
(although there are some concerns that this is a quick and dirty 
solution but fixing it properly will be risky).

I attach the proposed solution that I locally tested successfully by 
rebuilding the package with the patch applied.

NB: upstream finds that the bug is critical and will probably issue a 
0.21.1 version but as many pk11 or vpn user may be already affected (at 
least several just in my company), in the mean time you can build with 
the one line revert attached and drop when 0.21.1 comes out.

-- eric
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