RC4: fixed ContinuousBuffer() using MODE_MCRYPT
RC4: fixed ContinuousBuffer() using MODE_MCRYPT

Fixed multiple calls to ContinuousBuffer() using MODE_MCRYPT
paragonie-scott/phpseclib,thaigialai1987/phpseclib,ericariyanto/phpseclib,danog/phpseclib,splitice/phpseclib,creatuity/phpseclib,creatuity/phpseclib,phpseclib/phpseclib-php5,metaclassing/phpseclib,melya/phpseclib,danog/phpseclib,ericariyanto/phpseclib,terrafrost/phpseclib,kenichiii/phpseclib,kenichiii/phpseclib,phpseclib/phpseclib-php5,melya/phpseclib,metaclassing/phpseclib,paragonie-scott/phpseclib,thaigialai1987/phpseclib,splitice/phpseclib,phpseclib/phpseclib