Constructor attribute is not required with forward declaration

[tautschnig]

GCC happily accepts constructor (and destructor) definitions when an earlier forward declaration did not have any such attribute.

• 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.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (3cf1ade) 78.48% compared to head (7c41e4d) 78.50%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7594      +/-   ##
===========================================
+ Coverage    78.48%   78.50%   +0.02%     
===========================================
  Files         1670     1670              
  Lines       191775   191777       +2     
===========================================
+ Hits        150509   150554      +45     
+ Misses       41266    41223      -43     

Impacted Files	Coverage Δ
src/ansi-c/c_typecheck_base.cpp	83.13% <100.00%> (+0.06%)	⬆️

... and 3 files with indirect coverage changes

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