[XeTeX] recent changes in XeTeX building

[Akira Kakuto]

Hi,

> IIRC, on Windows the executable is just a wrapper, the actual code is
> packaged in a form of shared library, this is to work around the lack of
> symbolic links on some Windows filesystems (on Unix, xelatex is just a
> symlink to xetex binary, but in windows both are wrappers for libxetex
> of some sort).

xetex.exe is an actual executable file and xelatex.exe is
a wrapper. A reason why xetex.exe is not so large is that
I take the ICU data as a DLL: icudt44.dll.

Thanks,
Akira