#887 Broken Unicode detection when compile 0.7.72

[Vascom]

Broken Unicode detection in Fedora. Variable enable_unicode is empty, it broken wx-config version detection and compile stop.

As I see it use
pkg-config --variable=Unicode libzen
but output is empty.

Please correct it.

[Vascom]

I found that if use configure to build libzen - Unicode=yes is present in libzen.pc.
And when i use cmake - variable Unicode is absent.