Running JNLP on HiDPI(4k) displays with scaling

Hello,

I have a problem with IcedTea-web executing JNLP file from browser (namely Intel rmm3 remote console Jviewer) on HiDPI display in X11 - windows are too small and fonts are just unreadable.

It's possible to workaround with setting up environment variable **GDK_SCALE=3** or **GDK_DPI_SCALE=1.5** and that works just fine while executing **/usr/bin/itweb-settings** from command line.

I tried to create simple shell wrapper as /usr/bin/javaws
```
#!/bin/sh
export GDK_SCALE=3
/usr/share/icedtea-web/bin/javaws $@
```
but that didn't work out. Quick search on the web says that I need to pass -Dsun.java2d.uiScale=3 argument to javaws but adding it to the command line inside the wrapper didn't work for running JNLP files from web page either.

Current workaround is to run browser with set GDK_SCALE=3, this way env variable is passed to IcedTea.

Is there any other way to make icedTea DPI aware/scale interface on HiDPI screens?