Build fails with Verilator 5.x due to missing warning suppressions

[karabambus]

Building cve2_riscv_compliance with Verilator 5.x (tested: 5.044) fails because three warnings are promoted to errors in 5.x but are not suppressed in cve2_riscv_compliance.core:

• UNOPTFLAT
• MODDUP
• PINMISSING

tool_requirements.py specifies verilator >= 4.210 but the build is incompatible with 5.x as-is.

Fix: add -Wno-UNOPTFLAT -Wno-MODDUP -Wno-PINMISSING to verilator_options in dv/riscv_compliance/cve2_riscv_compliance.core.

[MikeOpenHWGroup]

Hi @karabambus, this is a "good catch", but the dv directory of this repo is planned for depreciation for two reasons:

1. The RISCOF framework for compliance testing will be displaced by the ACT4.0 framework.
2. The DV environment for the CVE2 is supported in one or more separate repos (e.g. cv32e20-dv).

Given that, I have marked this Issue as 'WontFix'.