treewide: De-inline uses of lib.boolToString

This commit should not change eval results

pkgs/development/libraries/glib/default.nix

@@ -108,7 +108,7 @@ stdenv.mkDerivation rec {
   mesonFlags = [
     # Avoid the need for gobject introspection binaries in PATH in cross-compiling case.
     # Instead we just copy them over from the native output.
-    "-Dgtk_doc=${if stdenv.hostPlatform == stdenv.buildPlatform then "true" else "false"}"
+    "-Dgtk_doc=${boolToString (stdenv.hostPlatform == stdenv.buildPlatform)}"
     "-Dnls=enabled"
     "-Ddevbindir=${placeholder ''dev''}/bin"
   ];