tests: Trim .txt files trailing whitespace

via OSX: find . -name '*.txt' -exec sed -i '' -E 's/[[:space:]]+$//' {} +

tests/realtimeGC/readme.txt

@@ -1,21 +1,21 @@
-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
+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