geary: fix cross compilation (#366636)

pkgs/by-name/ge/geary/package.nix

@@ -56,12 +56,10 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [
-    appstream-glib
     desktop-file-utils
     gettext
     gobject-introspection
     itstool
-    libxml2
     meson
     ninja
     pkg-config
@@ -72,6 +70,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     adwaita-icon-theme
+    appstream-glib
     enchant2
     folks
     gcr
@@ -91,6 +90,7 @@ stdenv.mkDerivation rec {
     libsecret
     libunwind
     libstemmer
+    libxml2
     libytnef
     sqlite
     webkitgtk_4_1
@@ -109,6 +109,8 @@ stdenv.mkDerivation rec {
     "-Dcontractor=enabled" # install the contractor file (Pantheon specific)
   ];
 
+  strictDeps = true;
+
   # NOTE: Remove `build-auxyaml_to_json.py` when no longer needed, see:
   # https://gitlab.gnome.org/GNOME/geary/commit/f7f72143e0f00ca5e0e6a798691805c53976ae31#0cc1139e3347f573ae1feee5b73dbc8a8a21fcfa
   postPatch = ''