tests: Trim .nim files trailing whitespace

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

tests/overflw/tovfint.nim

@@ -2,22 +2,22 @@ discard """
   file: "tovfint.nim"
   output: "works!"
 """
-# this tests the new overflow literals
-
-var
-  i: int
-i = int(0xffffffff'i32)
-when defined(cpu64):
-  if i == -1:
-    write(stdout, "works!\n")
-  else:
-    write(stdout, "broken!\n")
-else:
-  if i == -1:
-    write(stdout, "works!\n")
-  else:
-    write(stdout, "broken!\n")
-
-#OUT works!
+# this tests the new overflow literals
+
+var
+  i: int
+i = int(0xffffffff'i32)
+when defined(cpu64):
+  if i == -1:
+    write(stdout, "works!\n")
+  else:
+    write(stdout, "broken!\n")
+else:
+  if i == -1:
+    write(stdout, "works!\n")
+  else:
+    write(stdout, "broken!\n")
+
+#OUT works!