[PATCH] handle _SC_LEVEL4_CACHE_LINESIZE for the posix sysconf

[Pino Toscano]

Hi,

the posix implementation of sysconf returns 0 for all the cache-related 
constants, except for _SC_LEVEL4_CACHE_LINESIZE. The attached patch 
returns 0 for it as well.

Thanks,
-- 
Pino Toscano
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