Seccomp BPF: handle EINTR in error reporting setup.

Wrap dup2 with HANDLE_EINTR in the error reporting set-up for the BPF
support detection process.

We also print errno as an attempt to obtain more information on this puzzling
bug.

BUG=152530


Review URL: https://chromiumcodereview.appspot.com/11103021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@161443 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed