* callproc.c (Fcall_process): Fix vfork portability problems.
Do not assume that fd, count, filefd, and save_environ survive vfork. Fix bug whereby wrong errno value could be reported for pipe failure. Some minor cleanups, too, as follows. Move buf and bufsize to the context where they're needed. Change new_argv to be of type char **, as this is more convenient and avoids casts. (CALLPROC_BUFFER_SIZE_MIN, CALLPROC_BUFFER_SIZE_MAX): Now local constants, not macros.
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