extend SystemRequirements without changes in r-system-requirements package

[matteodelucchi]

Try to add binaries that are required by:

• INLA
• GSL (check if pattern in abn DESCRIPTION is recognised correctly)
• cmake (evtl. gcc, gcc-c++, gfortran, ...)
• JAGS (only Ubuntu for the moment, because other flavours require modifications in the r-system-requirements rule for JAGS)

[j-i-l]

Using pak we utilize the SystemRequirements.

For Ubuntu all of the dependencies can be installed, Fedora still needs manual install of JAGS (since it needs to be installed from source) and for MacOS and Windows we still need to install the system dependencies manually beforehand.