Add missing LONG_PTR type

lib/std/os/windows/bits.zig

@@ -60,6 +60,7 @@ pub const SIZE_T = usize;
 pub const TCHAR = if (UNICODE) WCHAR else u8;
 pub const UINT = c_uint;
 pub const ULONG_PTR = usize;
+pub const LONG_PTR = isize;
 pub const DWORD_PTR = ULONG_PTR;
 pub const UNICODE = false;
 pub const WCHAR = u16;