curl: fix handling of "-q" option

[Cherish98]

The match of the "-q" option (short for "--disable") should:

a) allow concatenation with other single-letters; and
b) be case-sensitive, lest confusing with "-Q" ("--quote")

For example,
curl -qv http://httpbin.org/get should ignore curlrc, and
curl -Q foo ftp://localhost/bar should not.

[bagder]

Thanks!