root: specify separateDebugInfo = true for all pltforms

pkgs/applications/science/misc/root/default.nix

@@ -265,9 +265,10 @@ stdenv.mkDerivation rec {
   # add the outPath of root.debug into NIX_DEBUG_INFO_DIRS (in PATH-like format)
   # and make sure that gdb from Nixpkgs can be found in PATH.
   #
-  # Building with debug info and separating them is not supported on all systems
-  # e.g. Darwin fails to support it (#203380)
-  separateDebugInfo = stdenv.hostPlatform.isLinux;
+  # Darwin currently fails to support it (#203380)
+  # we set it to true hoping to benefit from the future fix.
+  # Before that, please make sure if root.debug exists before using it.
+  separateDebugInfo = true;
 
   setupHook = ./setup-hook.sh;