* callproc.c (Fcall_process_region): Fix minor race and tune.

(create_temp_file): New function, with the temp-file-creation part
of the old Fcall_process_region.  Use Fcopy_sequence to create the
temp file name, rather than alloca + build_string, for simplicity.
Don't bother to block input around the temp file creation;
shouldn't be needed.  Simplify use of mktemp.  Use
record_unwind_protect immediately after creating the temp file;
this closes an unlikely race where the temp file was not removed.
Use memcpy rather than an open-coded loop.
(Fcall_process_region): Use the new function.  If the input is
empty, redirect from /dev/null rather than from a newly created
empty temp file; this avoids unnecessary file system traffic.

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