Linking library functions: support constructor functions

[tautschnig]

With 7f1cc0f we may remove __CPROVER_initialize from the goto model, which in turn made us fail to consider constructors called from it among the set of called functions (as well as any functions (transitively) called from these).

• 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

Base: 78.47% // Head: 78.47% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (8d3017f) compared to base (78fb718).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7453      +/-   ##
===========================================
- Coverage    78.47%   78.47%   -0.01%     
===========================================
  Files         1662     1662              
  Lines       191045   191044       -1     
===========================================
- Hits        149931   149929       -2     
- Misses       41114    41115       +1     

Impacted Files	Coverage Δ
src/goto-programs/link_to_library.cpp	100.00% <100.00%> (ø)
src/goto-programs/goto_inline.cpp	95.83% <0.00%> (-0.84%)	⬇️

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