[Fontconfig] check font-file for real SmallCaps support

[moonkid at posteo.org]

I am quite new to fontconfig.
I know fc-cat and fc-query and the documentation about it, too.

I want to check if a font (e.g. FreeSans) support real small caps. I
checked with XeTeX that FreeSans does support it.

But I see nothing about small caps in the output of "fc-query
FreeSans.ttf".