Short summary

Check upstream for more details.

• Add 'internal_condition_case_5' (bug#45303). commit
• Add 'gcc_jit_type_get_const' to Windows dynamic load machinery (bug#45303). commit
• Clean-up 'internal_condition_case_4' orphan declaration (bug#45303). commit
• Move diagnostic pragmas out of namespace-scope (bug#45303). commit
• Fix Windows libgccjit library name (bug#45303). commit