Modification to be able to build on linux

[ssabug]

Hi,
To build it on linux it had to replace in Source/Oscillator.h
auto** bufferData = buffer.getArrayOfWritePointers();
by
float* const* bufferData = buffer.getArrayOfWritePointers();

The plugin works fine in VST3 in Bitwig on Fedora 38.

[Riccardo Bona]

Hi @ssabug thanks for the heads up. I have not mantainted this code for a while. As soon as I have time I'll implement the fix.
Thanks again!