kmscon: add explicit freetype, fontconfig, zlib deps

9.3.3 added a new font_freetype backend that directly links against
freetype and fontconfig. These were previously pulled in transitively
via pango -> cairo, but should be explicit since meson now checks for
them directly.

zlib is now a required dependency (used by genunifont and mod-unifont
for compressed font data).

pkgs/by-name/km/kmscon/package.nix

@@ -9,6 +9,9 @@
   libdrm,
   libGLU,
   libGL,
+  freetype,
+  fontconfig,
+  zlib,
   pango,
   pkg-config,
   docbook_xsl,
@@ -47,6 +50,9 @@ stdenv.mkDerivation (finalAttrs: {
     libdrm
     libtsm
     libxkbcommon
+    freetype
+    fontconfig
+    zlib
     pango
     systemdLibs
     libgbm