miss `config.h` in `install/volepsi/include/volePSI` when Install volepsi

[zhouxv]

I want to provide feedback to the developers.

First, regarding commit 377ca63b9d8f4f6aede0d3a2e3d9078973a3ee10 on the master branch (the latest version).

The installation command used was:

python3 build.py -DVOLE_PSI_ENABLE_BOOST=ON --install=../../install/volepsi

During compilation in my project, the following error occurred because config.h was not generated during installation.
It should be necessary to fix install.cmake.