[Fontconfig] Changing behavior of evaluating multiple values in FcFontList()

[Lawrence D'Oliveiro]

On Fri, 21 Jun 2019 17:19:20 +0900, Akira TAGOH wrote:

> FcFontList() (as konwn as API which fc-list uses) evalues and returns
> a result only when all of conditions are matched. for example, doing
> :foo=a,b would means 'the value of 'foo' matches 'a' AND 'b' so far.
> but one may expects to see OR instead of AND in most cases.

Presumably, since the existing behaviour always returns false (can the
same property match more than one value at once?), such a change seems
reasonable, and the new behaviour would be more useful.