d08ccbfb77
Currently in Manjaro/Arch/Linux there's this issue:
```
/.../src/Mod/Raytracing/App/LuxProject.cpp: In member function ‘virtual App::DocumentObjectExecReturn* Raytracing::LuxProject::execute()’:
/.../src/Mod/Raytracing/App/LuxProject.cpp:85:20: error: variable ‘std::ifstream file’ has initializer but incomplete type
85 | ifstream file (fi.filePath().c_str());
| ^~
/.../src/Mod/Raytracing/App/LuxProject.cpp:89:20: error: variable ‘std::ofstream ofile’ has initializer but incomplete type
89 | ofstream ofile(tempName.c_str());
| ^~~~~~~~
```
See https://stackoverflow.com/questions/50355130/variable-stdofstream-outfile-has-initializer-but-incomplete-type.
Also edit `Precompiled.h` as compile fix