Relative require paths need updating

[Greg Tatum]

I'm running into this while working on: gregtatum/gl-engine#6

Take a folder structure like this:

• /glam/fog/struct.glsl
• /glam/fog/vars.glsl
• /glam/material/index.glsl

In /glam/material/index.glsl I have

#pragma glslify: import('../fog/vars.glsl')

void main() { ... }

Then in /glam/fog/vars.glsl

#pragma glslify: Fog = require('./struct.glsl')
uniform Fog uFog;

The #pragma glslify: Fog = require('./struct.glsl') gets inlined without the relative path being updated, so the glslify require step can't find my struct.glsl file.