Missing /share/dictionaries/en_stats.rds

Hi.  I'm on Windows 7 64-bit with latest R devel with and Rtools
(2.16.0.1926).  When I try to enable spell checking for 'R CMD check'
by setting environment variable '_R_CHECK_CRAN_INCOMING_USE_ASPELL_'
to 'true', I get:

* checking CRAN incoming feasibility ...Warning in aspell(files, filter = "dcf",
 control = control, encoding = encoding,  :
  The following dictionaries were not found:
  en_stats

Looking at the source code, I found that I'm missing 'en_stats.rds', e.g.

Sys.glob(file.path(R.home("share"), "dictionaries", "*.rds"))

character(0)

I see that the missing file is in
http://svn.r-project.org/R/trunk/share/dictionaries/.  Is there a
reason for why this is not part of the R source/binaries (e.g.
http://cran.r-project.org/src/base/R-2/R-2.15.2.tar.gz)?  Intentional
or forgotten?

/Henrik