Test the realtime GC, via long running process in a shared object, without linking nimrtl.dll/so.

tests/realtimeGC/readme.txt

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+Test the realtime GC without linking nimrtl.dll/so.
+
+Note, this is a long running test, default is 35 minutes. To change the
+the run time see RUNTIME in main.nim and main.c.
+
+You can build shared.nim, main.nim, and main.c by running make (nix systems)
+or maike.bat (Windows systems). They both assume GCC and that it's in your
+path. Output: shared.(dll/so), camin(.exe), nmain(.exe).
+
+To run the test: execute either nmain or cmain in a shell window.
+
+To build buy hand:
+
+  - build the shared object (shared.nim):
+
+    $ nim c shared.nim
+
+  - build the client executables:
+
+    $ nim c -o:nmain main.nim
+    $ gcc -o cmain main.c -ldl