[Fuzzer] Add a missing header in Fuchsia implementation
[Fuzzer] Add a missing header in Fuchsia implementation

This is needed for fd_set.

Differential Revision: https://reviews.llvm.org/D45852

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@330383 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt