[XeTeX] New feature planned for xetex

[Akira Kakuto]

Dear Philip,

> Unable to update the static FcBlanks: 0x0600
> Unable to update the static FcBlanks: 0x0601
> Unable to update the static FcBlanks: 0x0602
> Unable to update the static FcBlanks: 0x0603
> Unable to update the static FcBlanks: 0x06dd
> Unable to update the static FcBlanks: 0x070f
> Unable to update the static FcBlanks: 0x2028
> Unable to update the static FcBlanks: 0x2029
> Unable to update the static FcBlanks: 0xfff9
> Unable to update the static FcBlanks: 0xfffa
> Unable to update the static FcBlanks: 0xfffb

I think those are messages from the "old" fontconfig, in
TeX Live 2014 or former ones.
I expect that the new xetex.exe probably runs on TeX Live 2015.
(1) save the original 4 files
    dvipdfmx.dll, kpathsea621.dll, xdvipdfmx.exe, xetex.exe
(2) copy all 6 files to bin/win32 to test the new feature.
    (xelatex.exe is the same one as that in 2015, so it is
     not necessary to copy it.)

After tests, copy saved 4 files to bin/win32 to recover
the original TeX Live 2015.

Best,
Akira