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.
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.

rust-lang-nursery/libc,rust-lang-nursery/libc,rust-lang/libc,rust-lang-nursery/libc,rust-lang/libc,rust-lang/libc