__str2flags bug with fix attached

[Justin Mayfield]

I found a minor bug in __str2flags where empty strings or short strings 
will match all or many flags respectively.  Basically the test needs to 
ensure the test string is the same length as the table entry before 
doing a strncasecmp to avoid doing just a prefix test.

Attached is a fix I'm using.

Cheers,
Justin
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