Make it easier to turn off the use of libstacktrace

config.nims

@@ -43,15 +43,22 @@ else:
 
 switch("import", "testutils/moduletests")
 
+const useLibStackTrace = not defined(macosx) and
+                         not (defined(windows) and defined(i386)) and
+                         not defined(disable_libbacktrace)
+
+when useLibStackTrace:
+  --define:nimStackTraceOverride
+  switch("import", "libbacktrace")
+else:
+  --stacktrace:on
+  --linetrace:on
+
 # the default open files limit is too low on macOS (512), breaking the
 # "--debugger:native" build. It can be increased with `ulimit -n 1024`.
 if not defined(macosx):
   # add debugging symbols and original files and line numbers
   --debugger:native
-  if not (defined(windows) and defined(i386)) and not defined(disable_libbacktrace):
-    # light-weight stack traces using libbacktrace and libunwind
-    --define:nimStackTraceOverride
-    switch("import", "libbacktrace")
 
 --define:nimOldCaseObjects # https://github.com/status-im/nim-confutils/issues/9