warning C4005: WIN32_LEAN_AND_MEAN macro redefinition in win_delay_load_hook.c

[pvenkatraman]

WIN32_LEAN_AND_MEAN macro is defined unconditionally. The binding.gyp has this macro defined, in which builds on Windows report a warning. It would be nice to include on if not already defined as follows:

ifndef WIN32_LEAN_AND_MEAN

define WIN32_LEAN_AND_MEAN

endif

Thanks

[bnoordhuis]

#824