[PATCH] Fix compiler-rt build on FreeBSD 10.1

[Ed Maste]

SIOCADDRT and SIOCDELRT also do not exist in FreeBSD 10.1

```
commit 8293a6c1cc71ff884e6fb58936226f3c0bd21488
Author: glebius <glebius at FreeBSD.org>
Date:   Sat Mar 15 06:49:32 2014 +0000

    Garbage collect long time obsoleted (or never used) stuff from routing API.

Notes:
    svn path=/head/; revision=263203
```

http://reviews.llvm.org/D5703

Files:
  lib/sanitizer_common/sanitizer_platform_limits_posix.cc
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