Switch to GCC 13

Created by: corentinmaraisT

A parameter called --isa_extension has been added in cva6.py. Depending on the set of instruction the user want to use while compiling/executing a code (assembly/c/elf) the user can choose the extension to enable via this argument. i,m,a,f,d,c,g,v are not supposed to be specified here only z_, s_, or x_ extensions can be added via this argument. This argument is set to zicsr by default.

Ex:

python3 cva6.py --testlist=../tests/testlist_riscv-compliance-cv32a60x.yaml --test rv32i-I-ADD-01 --iss_yaml cva6.yaml --target cv32a60x --iss= --isa_extension=zicsr,zbb

In this example, the extension zicsr and zbb has been added to the isa initially associated to the target cv32a60x.