message: Change checktime_api and system_api to context_free_api
diff: @@ -468,9 +468,9 @@ class privileged_api : public context_aware_api {
  /// TODO: add inline/deferred with support for arbitrary permissions rather than code/current auth
  };
  -class checktime_api : public context_aware_api {
  +class checktime_api : public context_free_api {
  public:
  - using context_aware_api::context_aware_api;
  + using context_free_api::context_free_api;
  void checktime(uint32_t instruction_count) {
  context.checktime(instruction_count);
  @@ -574,9 +574,9 @@ class string_api : public context_aware_api {
  }
  };
  -class system_api : public context_aware_api {
  +class system_api : public context_free_api {
  public:
  - using context_aware_api::context_aware_api;
  + using context_free_api::context_free_api;
  void abort() {
  edump(("abort() called"));
  