bug#11854: make syntax-check -j issue

[Bernhard Voelker]

After pulling to the lastest revision (v8.17-37-g74427c7) and
a successful build (make -j), a subsequent "make syntax-check -j"
failed:

  ...
  8.47 vulnerable_makefile_CVE-2009-4029
  8.78 copyright_check
    CC     hostname.o
    CCLD   arch
    CCLD   arch
    CC     hostname.o
    CC     hostname.o
    CCLD   arch
  13.02 tight_scope
  15.36 THANKS_in_duplicates
  15.91 po_check
  mv: cannot move `.deps/hostname.Tpo' to `.deps/hostname.Po': No such file or 
directory
  make[1]: *** [hostname.o] Error 1
  make: *** [sc_check-AUTHORS] Error 2
  make: *** Waiting for unfinished jobs....
  mv: cannot stat `.deps/hostname.Tpo': No such file or directory
    CCLD   hostname
  make[1]: *** [hostname.o] Error 1
  make: *** [sc_man_file_correlation] Error 2

Another "make syntax-check -j" succeeded, i.e. there's some dependency
which is not taken care of for parallel syntax-check'ing.

I don't know CU's config scripts enough to know where to look at.
Any idea?

Have a nice day,
Berny