This fix a Problem when PASSENGER=on

src/cxx_supportlib/oxt/system_calls.cpp:135:9: note: expanded from macro 'CHECK_INTERRUPTION'

&& (!this_thread::syscalls_interruptable() \
     ^

/usr/include/c++/v1/__threading_support:465:11: note: candidate found by name lookup is 'std::__1::this_thread'
namespace this_thread

^

src/cxx_supportlib/vendor-modified/boost/thread/pthread/condition_variable.hpp:30:15: note: candidate found by name lookup is 'boost::this_thread'

namespace this_thread

PR: 241753
Submitted by: yani@pi-greece.eu
Reported by: linus.sundqvist@loopia.se
Sponsored by: Netzkommune GmbH