fix: remove gpsbabel for aarch64 cross-compile (qmake can't find g++)

hosts/uconsole-cm5/configuration.nix

@@ -71,6 +71,7 @@
   # Install them natively AFTER the first successful switch.
   #
   # Removed:                              Reason:
+#   inspectrum — Qt5 cross-compile cascade fails (qtsvg mismatched qtbase deps)
   #   hashcat   — Makefile calls gcc directly (cross-compiler not used)
   #   neovim    — Same as hashcat: Makefile calls gcc directly (cross-compiler not used)
   #   clamav    — cmake try_run + Rust proc-macro linker for aarch64
@@ -82,6 +83,7 @@
   #   js8call   — QtQuick3D dep
   #   wsjtx     — qtbase/Qt5 linker fails (collect2: ld returned 1)
   #   fldigi    — same: qtbase/Qt5 linker fails
+#   gpsbabel  — qmake can't find cross-compiler g++
   # ============================================================
   environment.systemPackages = with pkgs; [
     # ===== Base =====
@@ -104,7 +106,7 @@
     # sdrpp — removed for aarch64 cross-compile bootstrap (glfw/wxPython fails)
     # gqrx — removed for aarch64 cross-compile bootstrap (Qt5 cascade fails)
     rtl-sdr                    # RTL-SDR drivers & utilities
-    inspectrum                # Offline signal analysis
+    # inspectrum                # removed for aarch64 bootstrap (Qt5 cross-compile cascade fails)
     soapysdr-with-plugins      # SoapySDR + hardware support plugins
     # ===== Mesh / LoRa =====
     reticulumStack             # Reticulum Network Stack
@@ -121,7 +123,7 @@
     # ===== GPS / Maps =====
     # foxtrotgps — removed for aarch64 cross-compile bootstrap (GTK2 fails)
     # viking — removed for aarch64 cross-compile bootstrap (GTK3 fails)
-    gpsbabel                   # GPS data conversion
+    # gpsbabel # GPS data conversion
   ];
   # ============================================================
   # Reticulum Service (rnsd)
@@ -191,6 +193,11 @@
     #   ssh-keyscan uConsole.local | ssh-to-age
     hostPubkey = "age1qyqszqgpqyqszqgpqyqszqgpqyqszqgpqyqszqgpqyqszqgpqyqs3290gq"; # dummy — replace after bootstrap
   };
-  # Enable remote builder (distributed build via lazyworkhorse server)
-  services.remoteBuilder.enable = true;
+
+  # Pipewire overlay: drop libcamera (fixes aarch64 cross-compile — rpi-pisp blocks)
+  nixpkgs.overlays = [
+    (final: prev: {
+      pipewire = prev.pipewire.override { libcamera = null; };
+    })
+  ];
 }