Enable cpp-from-CVS regression tests

[tautschnig]

The first commit moves files, the second formats them.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #5935 (c1d5a1c) into develop (0b7431f) will increase coverage by 0.27%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #5935      +/-   ##
===========================================
+ Coverage    73.95%   74.22%   +0.27%     
===========================================
  Files         1431     1431              
  Lines       155291   155291              
===========================================
+ Hits        114842   115264     +422     
+ Misses       40449    40027     -422     

Impacted Files	Coverage Δ
src/ansi-c/expr2c.cpp	68.77% <0.00%> (+0.04%)	⬆️
src/ansi-c/scanner.l	61.72% <0.00%> (+0.08%)	⬆️
src/goto-programs/goto_convert.cpp	90.98% <0.00%> (+0.11%)	⬆️
src/cpp/cpp_declarator_converter.cpp	79.23% <0.00%> (+0.34%)	⬆️
...c/goto-programs/remove_const_function_pointers.cpp	81.45% <0.00%> (+0.36%)	⬆️
src/ansi-c/c_typecheck_expr.cpp	75.44% <0.00%> (+0.39%)	⬆️
src/cpp/cpp_convert_type.cpp	72.45% <0.00%> (+0.59%)	⬆️
src/goto-programs/builtin_functions.cpp	55.32% <0.00%> (+0.59%)	⬆️
src/util/std_types.h	95.10% <0.00%> (+0.69%)	⬆️
src/cpp/cpp_typecheck_compound_type.cpp	86.64% <0.00%> (+0.94%)	⬆️
... and 18 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ac11ec8...c1d5a1c. Read the comment docs.