spank: remove spank_set_remote_options_env
The spank_set_remote_options_env() function is not used anywhere except internal to plugstack.c, so remove it from plugstack.h. Then redefine it to take a spank_stack argument so that it doesn't refer to the global_spank_stack. Finally rename to spank_stack_set_remote_options_env() to clarify the intent.
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