"make bootstrap" from cvs/git fails

[Jim Meyering]

This could be due to parallelism, because I always build with
make -j3 or more.  My last successful "make bootstrap"s were
on April 3,4,5.  Since then, they all fail like this:

  Wrote /mirror/d/emacs/lisp/net/webjump.elc
  Compiling /mirror/d/emacs/lisp/./net/zeroconf.el
  Wrote /mirror/d/emacs/lisp/net/zeroconf.elc
  Compiling /mirror/d/emacs/lisp/./org/org-export-latex.el

  In toplevel form:
  ../../../../mirror/d/emacs/lisp/org/org-export-latex.el:52:1:Error: Required 
feature `cal-loaddefs' was not provided
  make[2]: *** [compile] Error 1
  make[2]: Leaving directory `/t/jt15754.OzxGHc/emacs/lisp'
  make[1]: *** [bootstrap-build] Error 2
  make[1]: Leaving directory `/t/jt15754.OzxGHc/emacs'
  make: *** [bootstrap] Error 2