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47dc3dec0a
(win_env::operator = ): Declare new operator. (win_env::reset): Declare new function. (win_env::~win_env): Declare new destructor. (getwinenv): Add optional third argument to declaration. * environ.cc (conv_envvars): Accommodate immediate field. (win_env::operator =): Define new operator. (win_env::~win_env): Define new destructor. (win_env::add_cache): Add value to environment immediately if "immediate" is set. (getwinenv): Accept optional third argument which will be used to store "cached" values to avoid overwriting real cache. (spenv::force): Declare new field. (spenvs): Accommodate force field. Add "PATH=" with force set to true. (spenv::retrieve): Avoid duping anything if we're not building an envblock. (build_env): Ditto. Use size of potentially constructed new environment block to determine if we need to create an environment block. Pass getwinenv temporary storage to avoid inappropriately overwriting the environment cache.