fontconfig configration file search path in static build on windows

[Tatsuro M. <tma...@ya...>]

This is just information.

From an demand, I have built static linked gnuplot binary on windows.

However, fontconfig feature could not be used because 
fontconfig cannot find fontconfig configuration path
if fontconfig path is relative to ../etc/fonts from bin.

This directory structure only effective using dll version fontconfig.

For static link on windows, fontconfig 2.11.1, fontconfig application
search fonts directory where a exe file exist.

See:
https://lists.freedesktop.org/archives/fontconfig/2016-February/005676.html


Tatsuro