[ewiki] bugreport + fix

Hi there!

If I am not mistaken there is a bug in function ewiki_auth_user() in ewiki.php 
concerning authentication via crypt():

@~line 2532 it says: 

    || ($enc_pw == crypt($password, substr($_pw, 0, 2)))

it should be:

    || ($enc_pw == crypt($password, substr($enc_pw, 0, 2)))

i.e. $enc_pw instead of $_pw. There were no errors so far, since "_pw" was 
taken to be an empty string, which also works for crypt() theoretically - but 
you need the "salt". Solong, timm

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