[Fontconfig] Fontconfig cache file update fails on Windows (also Cygwin)

[Masamichi Hosoda]

>> It is better that there is a possibility of success rather than a
>> way that does not succeed at all, in my humble opinion.
> 
> Exactly.

I'd like my patch to be merged.

This issue is very major and serious to use fontconfig on Windows.

Certainly, my patch is not perfect.
However, the current fontconfig always fails to update the cache.
With my patch, fontconfig almost succeeds to update the cache.
It obviously improves the issue, in my humble opinion.


W32TeX (a TeX binary distribution for Windows) has applied my patch.

http://w32tex.org/ChangeLog
has the following description.

...snip...
[2017/01/15]
...snip...
(02) xetex-w32.tar.xz
     Apply a patch for fontconfig by M. Hosoda:
     https://bugs.freedesktop.org/show_bug.cgi?id=99360.
     Now XeTeX can update font cache files.
...snip...
(04) win64/xetex-w64.tar.xz
     Apply a patch for fontconfig by M. Hosoda:
     https://bugs.freedesktop.org/show_bug.cgi?id=99360.
     Now XeTeX can update font cache files.
...snip...


In W32TeX, the issue has been resolved,
and problems caused by the patch have not raised.