fixes the regression #12860 caused; hotfix

lib/pure/os.nim

@@ -3119,7 +3119,7 @@ template rawToFormalFileInfo(rawInfo, path, formalInfo): untyped =
       assert(path != "") # symlinks can't occur for file handles
       formalInfo.kind = getSymlinkFileKind(path)
 
-when defined(js):
+when defined(js) or defined(nimscript):
   when not declared(FileHandle):
     type FileHandle = distinct int32
   when not declared(File):

lib/system/nimscript.nim

@@ -272,6 +272,9 @@ proc selfExec*(command: string) {.
       raise newException(OSError, "FAILED: " & c)
     checkOsError()
 
+from os import paramCount, paramStr
+export paramCount, paramStr
+
 proc put*(key, value: string) =
   ## Sets a configuration 'key' like 'gcc.options.always' to its value.
   builtin