[tor-dev] small patch to allow gcc -fno-common for better ASAN coverage

[starlight.2015q2 at binnacle.cx]

Per 

https://code.google.com/p/address-sanitizer/wiki/Flags

one benefits from compiling with -fno-common
when -fsanitize=address is active

The attached patch converts the single
common variable to a global/extern
variable.

Seems a good idea to me.  Have run this
with no issues, but more ASAN
coverage is better than less.
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