env-hash: now persistent and synced with setenv.

* sysif.c (env_hash): Function renamed to get_env_hash and a
static variable named env_hash introduced.
Function returns a previously allocated hash table, if
it exists, except in compat mode.
(getenv_wrap): Stash the result into the hash also.
(setenv_wrap): Keep the hash up-to-date with the action of
setenv.
(unsetenv_wrap): Also delete from the hash.
(sysif_init): Protect the env_hash variable from gc.

* txr.1: Documented, with compat notes.

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