dbxml: move db62 to propagatedBuildInputs. (#45878)

Some public DB XML headers include db.h from Berkeley DB. Move db62
to propagatedBuildInputs, to ensure that packages with a dependency
on dbxml, but without a dependency on db compile.

pkgs/development/libraries/dbxml/default.nix

@@ -15,7 +15,11 @@ stdenv.mkDerivation rec {
   ];
 
   buildInputs = [
-    db62 xercesc xqilla
+    xercesc xqilla
+  ];
+
+  propagatedBuildInputs = [
+    db62
   ];
 
   configureFlags = [