core: fallback to AccessFlags::EXISTS if host OS does not support AccessFlags::EXECUTE
core: fallback to AccessFlags::EXISTS if host OS does not support AccessFlags::EXECUTE

mikymod/crown,dbartolini/crown,mikymod/crown,mikymod/crown,taylor001/crown,galek/crown,taylor001/crown,galek/crown,galek/crown,dbartolini/crown,galek/crown,dbartolini/crown,mikymod/crown,dbartolini/crown,taylor001/crown,taylor001/crown