user32: Use a safer method of freeing user handles to prevent zeroing out a newly allocated handle

[Paul Chitescu]

Changelog:
	user32: Use a safer method of freeing user handles to prevent zeroing out a 
newly allocated handle

Fixes random crashes in multithreaded programs rapidly creating and destroying 
many handles (bitmaps, icons, windows, etc.)

Supersedes "user32: Lock user32 in alloc_user_handle to fix races with 
get_user_handle_ptr" without taking the user lock.

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