Auto merge of #1319 - jasonbking:readdir, r=gnzlbg
This fixes issue #1318 - on Solarish systems __posix_readdir_r is only defined for 32-bit Solarish targets. Since rust doesn't currently support 32-bit Solarish targets, the line is both unnecessary and wrong. As found with the latest fd binary, removing the line fixed the fd build (and fd then works as expected).
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