Test failures with gcc 6 and recent Linux distro

On a recently upgraded Linux machine these tests are now failing:

	 21 - code_api|common.nativeexec_exe (Failed)
	 22 - code_api|common.nativeexec_bindnow (Failed)
	 24 - code_api|common.nativeexec_exe_opt (Failed)
	 25 - code_api|common.nativeexec_bindnow_opt (Failed)
	 67 - code_api|linux.sigcontext (Failed)
	155 - code_api|client.signal (Failed)
	184 - code_api|client.pcache-use (Failed)
	284 - code_api|api.static_sideline_FLAKY (Failed)

The failure are likely related to upgrading to gcc 6 and perhaps other pieces of the distro.