gst_all_1.gstreamer: enable strictDeps and fix cross

checked with diffoscope

pkgs/development/libraries/gstreamer/core/default.nix

@@ -4,7 +4,6 @@
 , ninja
 , pkg-config
 , gettext
-, gobject-introspection
 , bison
 , flex
 , python3
@@ -17,6 +16,8 @@
 , bash-completion
 , lib
 , CoreServices
+, withIntrospection ? stdenv.buildPlatform == stdenv.hostPlatform
+, gobject-introspection
 }:
 
 stdenv.mkDerivation rec {
@@ -37,6 +38,7 @@ stdenv.mkDerivation rec {
     sha256 = "0cghi6n4nhdbajz3wqcgbh5xm94myvnqgsi9g2bz9n1s9904l2fy";
   };
 
+  strictDeps = true;
   nativeBuildInputs = [
     meson
     ninja
@@ -47,11 +49,14 @@ stdenv.mkDerivation rec {
     python3
     makeWrapper
     glib
-    gobject-introspection
     bash-completion
 
     # documentation
     # TODO add hotdoc here
+  ] ++ lib.optionals stdenv.isLinux [
+    libcap # for setcap binary
+  ] ++ lib.optionals withIntrospection [
+    gobject-introspection
   ];
 
   buildInputs = [
@@ -60,6 +65,8 @@ stdenv.mkDerivation rec {
     libcap
     libunwind
     elfutils
+  ] ++ lib.optionals withIntrospection [
+    gobject-introspection
   ] ++ lib.optionals stdenv.isDarwin [
     CoreServices
   ];
@@ -72,8 +79,7 @@ stdenv.mkDerivation rec {
     "-Ddbghelp=disabled" # not needed as we already provide libunwind and libdw, and dbghelp is a fallback to those
     "-Dexamples=disabled" # requires many dependencies and probably not useful for our users
     "-Ddoc=disabled" # `hotdoc` not packaged in nixpkgs as of writing
-  ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
-    "-Dintrospection=disabled"
+    "-Dintrospection=${if withIntrospection then "enabled" else "disabled"}"
   ] ++ lib.optionals stdenv.isDarwin [
     # darwin.libunwind doesn't have pkg-config definitions so meson doesn't detect it.
     "-Dlibunwind=disabled"