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The old-style cookie support stores the cookie domains with a leading full
stop (e.g. .riscosopen.org) but if a cookie was created with HTTP_AddCookie
you could get round this restriction.  A cookie with domain riscosop.org
created that way would have matched the host domain www.riscosopen.org.

This change fixes that. This code will need to be revisited to implement
RFC 6265 because of host-only matching and stripping the leading full stops,
but for the moment this removes a domain-matching bug in the old-style cookie
support.

Version 1.08. Tagged as 'HTTP-1_08'