'varying' is deprecated, use 'in/out' instead

[Ali-RS]

Hi

I am getting shader compilation error: 'varying' is deprecated, use 'in/out' instead when using drop shadow filter on Windows 11 with both intel and nvidia GPUs.

Changing GLS version to 120 in below line fixed it.

SimFX/src/main/resources/MatDefs/shadow/Shadows.j3md

Line 18 in f39387f

FragmentShader GLSL130: MatDefs/shadow/Shadows.frag