compiler: Trim .nim files trailing whitespace

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

compiler/nimeval.nim

@@ -10,7 +10,7 @@
 ## exposes the Nim VM to clients.
 
 import
-  ast, modules, passes, passaux, condsyms, 
+  ast, modules, passes, passaux, condsyms,
   options, nimconf, lists, sem, semdata, llstream, vm
 
 proc execute*(program: string) =