SSH2: replace _is_includable() with stream_resolve_include_path
SSH2: replace _is_includable() with stream_resolve_include_path

creatuity/phpseclib,kenichiii/phpseclib,danog/phpseclib,paragonie-scott/phpseclib,thaigialai1987/phpseclib,melya/phpseclib,melya/phpseclib,metaclassing/phpseclib,creatuity/phpseclib,danog/phpseclib,kenichiii/phpseclib,splitice/phpseclib,splitice/phpseclib,phpseclib/phpseclib,terrafrost/phpseclib,paragonie-scott/phpseclib,metaclassing/phpseclib,thaigialai1987/phpseclib