make cleandocs missing files with v4.9-rc3

[Jim Davis]

On my Ubuntu 16.04 system, make htmldocs works just fine (hurrah!) but
make cleandocs misses a fair number of files:

  HTML    Documentation/DocBook/index.html
jim@krebstar:~/linux-rc$ make cleandocs
jim@krebstar:~/linux-rc$ git status
HEAD detached at v4.9-rc3
nothing to commit, working directory clean
jim@krebstar:~/linux-rc$ git clean -fdx
Removing Documentation/DocBook/.alsa-driver-api.xml.cmd
Removing Documentation/DocBook/.crypto-API.xml.cmd
Removing Documentation/DocBook/.debugobjects.xml.cmd
Removing Documentation/DocBook/.deviceiobook.xml.cmd
Removing Documentation/DocBook/.filesystems.xml.cmd
Removing Documentation/DocBook/.gadget.xml.cmd
Removing Documentation/DocBook/.genericirq.xml.cmd
Removing Documentation/DocBook/.iio.xml.cmd
Removing Documentation/DocBook/.kernel-api.xml.cmd
Removing Documentation/DocBook/.kernel-hacking.xml.cmd
Removing Documentation/DocBook/.kernel-locking.xml.cmd
Removing Documentation/DocBook/.kgdb.xml.cmd
Removing Documentation/DocBook/.libata.xml.cmd
Removing Documentation/DocBook/.librs.xml.cmd
Removing Documentation/DocBook/.lsm.xml.cmd
Removing Documentation/DocBook/.mtdnand.xml.cmd
Removing Documentation/DocBook/.networking.xml.cmd
Removing Documentation/DocBook/.rapidio.xml.cmd
Removing Documentation/DocBook/.regulator.xml.cmd
Removing Documentation/DocBook/.s390-drivers.xml.cmd
Removing Documentation/DocBook/.scsi.xml.cmd
Removing Documentation/DocBook/.sh.xml.cmd
Removing Documentation/DocBook/.tracepoint.xml.cmd
Removing Documentation/DocBook/.uio-howto.xml.cmd
Removing Documentation/DocBook/.usb.xml.cmd
Removing Documentation/DocBook/.w1.xml.cmd
Removing Documentation/DocBook/.writing-an-alsa-driver.xml.cmd
Removing Documentation/DocBook/.writing_musb_glue_layer.xml.cmd
Removing Documentation/DocBook/.writing_usb_driver.xml.cmd
Removing Documentation/DocBook/.z8530book.xml.cmd
Removing Documentation/sphinx/cdomain.pyc
Removing Documentation/sphinx/kernel-doc.pyc
Removing Documentation/sphinx/kernel_include.pyc
Removing Documentation/sphinx/load_config.pyc
Removing Documentation/sphinx/rstFlatTable.pyc
Removing scripts/.check-lc_ctype.cmd
Removing scripts/.docproc.cmd
Removing scripts/basic/.fixdep.cmd
Removing scripts/basic/fixdep
Removing scripts/check-lc_ctype
Removing scripts/docproc


-- 
Jim