Don't check for iconv, it's already a requirement

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Fix an old typo

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
MCRYPT_MODE_ECB doesn't require an IV

The "warning" bug is not present in 5.3+
https://bugs.php.net/bug.php?id=43143

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>