In various places checkprefix function is used in a way that can lead to potential forward compatibility issues. As an example if new authentication method "NTLM3" would be added, checkprefix("NTLM", auth) would incorrectly match it. Now either space, null char, or comma is required after the method value.
In addition fixed a bogus use of checkprefix function in Kerberos name_to_level function. The CURLOPT_KRBLEVEL API provided string was used as the prefix to check. It would kind of work if correct values were passed but would match incomplete strings as specific values. For example "c" would match to PROT_CLEAR. Using curl_strequal makes more sense here.
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