[Nickle] GCC 10 compatibility patch

[Michel Alexandre Salim]

Hi Keith,

Fedora's upcoming 32 release will ship with GCC 10, which defaults to 
-fno-common to optimize global variable access.

As such, having multiple declarations of the same variables now cause a 
link failure -- I've attached the patch I'm using for the Fedora package 
of Nickle; all test cases pass fine with it applied.

Best regards,

-- 
Michel Alexandre Salim
profile: https://keybase.io/michel_slm
GPG key: 96A7 A6ED FB4D 2113 4056 3257 CAF9 AD10 ACB1 BEF2
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