message: Add DLL ATTACH / DETACH constants
  This includes:
  DLL_PROCESS_ATTACH
  DLL_THREAD_ATTACH
  DLL_THREAD_DETACH
  DLL_PROCESS_DETACH
  Fixes
diff: @@ -2758,3 +2758,7 @@ STRUCT!{struct WOW64_LDT_ENTRY {
  UNION!(WOW64_LDT_ENTRY, HighWord, Bytes, Bytes_mut, WOW64_LDT_ENTRY_Bytes);
  UNION!(WOW64_LDT_ENTRY, HighWord, Bits, Bits_mut, WOW64_LDT_ENTRY_Bits);
  pub type PWOW64_LDT_ENTRY = *mut WOW64_LDT_ENTRY;
  +pub const DLL_PROCESS_ATTACH: DWORD = 1;
  +pub const DLL_THREAD_ATTACH: DWORD = 2;
  +pub const DLL_THREAD_DETACH: DWORD = 3;
  +pub const DLL_PROCESS_DETACH: DWORD = 0;
  