Don't use strcasecmp(), use ascii_strcasecmp().

Don't use strcasecmp(), use ascii_strcasecmp().

Not all platforms have strcasecmp() (yes, it's in the Single UNIX
Specification, but not all platforms are UNIX or even UN*X; there's some
obscure company in Redmond, Washington who have an OS on which we run),
and on those that do, there's no guarantee that strcasecmp() will treate
A-Z and a-z as being equivalent ("I" and "i" aren't equivalent in a
Turkish locale, for example).

Fix indentation while we're at it.