packaging: version the build-dependency on po4a >= 0.66

0.66 is currently available in unstable and bookworm (testing).  Bullseye
(stable) has 0.62, and that fails with our asciidoc documentation.
Buster (oldstable) has 0.55.

I've rebuilt unstable's 0.66 for bullseye and buster and put the debs
in our apt archive at wlo.

Author: SebKuzminsky

debian/control.top.in

@@ -27,7 +27,7 @@ Build-Depends:
     libusb-1.0-0-dev,
     libxmu-dev,
     netcat,
-    po4a,
+    po4a (>= 0.66),
     procps,
     psmisc,
     python3,