strange build error today: "Renaming: Invalid argument"

[Ted Zlatanov <tzz@lifelogs.com>]

I did `make bootstrap` to no avail. FWIW I'm using an encrypted
partition on Ubuntu 17.04 as my home directory, in case it
matters--maybe this only happens in that setup.

git bisect says the issue is with this commit, which relates to the
error message.

commit 1f9f514e7c2ba41b0954d0141f99652f6a53a107
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Wed Aug 2 01:53:46 2017 -0700

    When renaming a file, ask only if EEXIST or ENOSYS

Thanks!
Ted

% git status
(clean tree)
% make distclean; ./autogen.sh all; ./configure --with-modules ; make -j10
...
  GEN      net/tramp-loaddefs.el
Source file ‘/home/tzz/source/emacs/emacs/lisp/emacs-lisp/map.el’ newer than byte-compiled file
Source file ‘/home/tzz/source/emacs/emacs/lisp/emacs-lisp/cl-lib.el’ newer than byte-compiled file
Source file ‘/home/tzz/source/emacs/emacs/lisp/emacs-lisp/gv.el’ newer than byte-compiled file
Renaming: Invalid argument, /home/tzz/source/emacs/emacs/lisp/net/tramp-loaddefs.el198334G4, /home/tzz/source/emacs/emacs/lisp/net/tramp-loaddefs.el
Makefile:424: recipe for target 'net/tramp-loaddefs.el' failed
make[2]: *** [net/tramp-loaddefs.el] Error 255

% git status

Untracked files:
        admin/unidata/unidata-gen.elc198064G4
        admin/unidata/uvs.elc198044G4
        lisp/net/tramp-loaddefs.el198114G4
        lisp/net/tramp-loaddefs.el198334G4