A RHEL 8 test was failing because it uses go1.16. The old style must
be retained for backwards compat.
Fixes: 9a36de84c ("Go: Use Homebrew include paths")
Reviewed-by: Andrew Clayton <a.clayton@nginx.com>
Reviewed-by: Dylan Arbour <d.arbour@f5.com>
Signed-off-by: Danielle De Leo <d.deleo@f5.com>