message: Added missing constants.
diff: @@ -10,6 +10,10 @@ use shared::guiddef::GUID;
  use shared::minwindef::{BOOL, DWORD, FILETIME, LPDWORD, UCHAR};
  use shared::windef::HWND;
  use um::winnt::{BOOLEAN, HANDLE, LONG, LONGLONG, LPCSTR, LPCWSTR, LPSTR, LPWSTR};
  +pub const PDH_MAX_COUNTER_NAME: usize = 1024;
  +pub const PDH_MAX_INSTANCE_NAME: usize = 1024;
  +pub const PDH_MAX_COUNTER_PATH: usize = 2048;
  +pub const PDH_MAX_DATASOURCE_PATH: usize = 1024;
  pub const PDH_FMT_RAW: DWORD = 0x00000010;
  pub const PDH_FMT_ANSI: DWORD = 0x00000020;
  pub const PDH_FMT_UNICODE: DWORD = 0x00000040;
  