ROOT build options

We may still need to enable some features for the event generators, https://github.com/JeffersonLab/clas12-mcgen/blob/main/root/Makefile, copy/pasted here:

		-DCMAKE_CXX_STANDARD=17 \
		-Dbuiltin_glew=ON \
		-Dmathmore=ON \
		-Dfftw3=ON \
		-Dpythia8=ON