tinysparql: remove systemd and dbus dependencies

The only thing these are used for is determining what path to install
services to.  For D-Bus, there's a sensible default, but for systemd,
we have to specify.

I've also removed the platform check for installing the units, because
the main reason for it would have been to avoid the build failure, and
they shouldn't hurt and we have seen attempts to port systemd to other
platforms…

pkgs/by-name/ti/tinysparql/package.nix

@@ -26,7 +26,6 @@
   libsoup_3,
   json-glib,
   avahi,
-  systemd,
   dbus,
   man-db,
   writeText,
@@ -75,22 +74,17 @@ stdenv.mkDerivation (finalAttrs: {
       mesonEmulatorHook
     ];
 
-  buildInputs =
-    [
-      glib
-      libxml2
-      sqlite
-      icu
-      libsoup_3
-      libuuid
-      json-glib
-      avahi
-      libstemmer
-      dbus
-    ]
-    ++ lib.optionals stdenv.hostPlatform.isLinux [
-      systemd
-    ];
+  buildInputs = [
+    glib
+    libxml2
+    sqlite
+    icu
+    libsoup_3
+    libuuid
+    json-glib
+    avahi
+    libstemmer
+  ];
 
   nativeCheckInputs = [
     dbus
@@ -100,6 +94,7 @@ stdenv.mkDerivation (finalAttrs: {
   mesonFlags =
     [
       "-Ddocs=true"
+      "-Dsystemd_user_services_dir=${placeholder "out"}/lib/systemd/user"
       (lib.mesonEnable "introspection" withIntrospection)
       (lib.mesonEnable "vapi" withIntrospection)
     ]
@@ -114,10 +109,7 @@ stdenv.mkDerivation (finalAttrs: {
       [
         "--cross-file=${crossFile}"
       ]
-    )
-    ++ lib.optionals (!stdenv.hostPlatform.isLinux) [
-      "-Dsystemd_user_services=false"
-    ];
+    );
 
   doCheck = true;