message: Return a more useful error code when injection fails on windows
diff: @@ -861,11 +861,12 @@ ExecuteResult Process::InjectIntoProcess(uint32_t pid, const rdcarray<Environmen
  uintptr_t loc = FindRemoteDLL(pid, CONCAT(L, STRINGIZE(RDOC_DLL_FILE)) L".dll");
  - uint32_t controlident = 0;
  + ExecuteResult result = {ReplayStatus::Succeeded, 0};
  if(loc == 0)
  {
  RDCERR("Can't locate " STRINGIZE(RDOC_DLL_FILE) ".dll in remote PID %d", pid);
  + result.status = ReplayStatus::InjectionFailed;
  }
  else
  {
  @@ -882,8 +883,8 @@ ExecuteResult Process::InjectIntoProcess(uint32_t pid, const rdcarray<Environmen
  InjectFunctionCall(hProcess, loc, "INTERNAL_SetCaptureOptions", (CaptureOptions *)&opts,
  sizeof(CaptureOptions));
  - InjectFunctionCall(hProcess, loc, "INTERNAL_GetTargetControlIdent", &controlident,
  - sizeof(controlident));
  + InjectFunctionCall(hProcess, loc, "INTERNAL_GetTargetControlIdent", &result.ident,
  + sizeof(result.ident));
  if(!env.empty())
  {
  @@ -916,7 +917,7 @@ ExecuteResult Process::InjectIntoProcess(uint32_t pid, const rdcarray<Environmen
  CloseHandle(hProcess);
  - return {ReplayStatus::Succeeded, controlident};
  + return result;
  }
  uint32_t Process::LaunchProcess(const char *app, const char *workingDir, const char *cmdLine,
  