do some adjustment

[Chiheng Xu]

	* dcrt0.cc (dll_crt0_1): remove call to fork_init().
	* fork.cc (fork_init): remove.
	* globals.cc (fork_init): add user_data global variable.
	* perprocess.h (fork_init): change user_data from macro to variable
declaration.
	* pinfo.cc (fork_init): adjust.


-- 
Chiheng Xu
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