sane.programs.megapixels: ship w/o qt deps

hosts/common/programs/default.nix

@@ -22,6 +22,7 @@
     ./koreader
     ./libreoffice.nix
     ./lemoa.nix
+    ./megapixels.nix
     ./mepo.nix
     ./mpv.nix
     ./msmtp.nix

hosts/common/programs/megapixels.nix

@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+{
+  sane.programs.megapixels.package = pkgs.megapixels.override {
+    # megapixels uses zbar to read barcodes.
+    # zbar by default ships zbarcam-gtk and zbarcam-qt, neither of which megapixels needs.
+    # but the latter takes a dep on qt, which bloats the closure and the build, so disable this feature.
+    zbar = pkgs.zbar.override {
+      enableVideo = false;
+    };
+  };
+}