Merge pull request dotnet/coreclr#11988 from stephentoub/fix_fds
authorStephen Toub <stoub@microsoft.com>
Thu, 1 Jun 2017 03:05:06 +0000 (23:05 -0400)
committerGitHub <noreply@github.com>
Thu, 1 Jun 2017 03:05:06 +0000 (23:05 -0400)
Ensure several runtime file descriptors are CLOEXEC

Commit migrated from https://github.com/dotnet/coreclr/commit/05732e6e9d79b0f65490c3bac5698cf8fe8ac9a4


Trivial merge