aiOslShader: could not find include file: stdosl.h when using network path

[matthias.pichler2LM87]

Hey!

We recently tried using an aiOslShader in Maya, but came across an issue on some of our machines. This error kept getting raised when we tried to compile a shader:
```
# Error: Compilation Failed # # Error: C:\Users\sercan.topaloglu\<buffer>:1: error: error: could not find include file: \px\o\app\ext\maya_mtoa\3.3.0.0-pxo.2\platform-windows\maya-2018\bin\../osl/include/stdosl.h # Traceback (most recent call last): # File "c:\users\sercan~1.top\appdata\local\temp\rez_env_a3c3507c9829f2f226150cec3a1fe39a2ba89ace61240ea3aaf9983abe9b513e\mtoa\ui\ae\aiOslShaderTemplate.py", line 265, in <lambda> # cmds.button('compileButtonPath', label='Compile OSL Code', command=lambda *args: self.compiler(attrName, self.code_widget_path)) # File "c:\users\sercan~1.top\appdata\local\temp\rez_env_a3c3507c9829f2f226150cec3a1fe39a2ba89ace61240ea3aaf9983abe9b513e\mtoa\ui\ae\aiOslShaderTemplate.py", line 284, in compiler # cmds.error(oslMayaScene.compilationErrors) # RuntimeError: C:\Users\sercan.topaloglu\<buffer>:1: error: error: could not find include file: \px\o\app\ext\maya_mtoa\3.3.0.0-pxo.2\platform-windows\maya-2018\bin\../osl/include/stdosl.h #
```

After some troubleshooting, we figured out it works perfectly fine if the `maya_mtoa` package is cached locally and referred to with `C:\[...]\maya_mtoa\[...]` instead of `\\px\o\app\ext\maya_mtoa\[...]`.

Couldn't find a page where I can post an official bug report, so feel free to move this to it's appropriate place.

Cheers!
~ Matthias Pichler