export-file-local-symbol A,B: selective export of file-local symbols

[tautschnig]

Previously, --export-file-local-symbols would mark (and mangle) all
file-local symbols. With --export-file-local-symbol A (or
--export-file-local-symbol A,B), only A (or A and B) will be mangled and
exported.

• 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.
• 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

Merging #6339 (0e62531) into develop (9d774a7) will increase coverage by 0.00%.
The diff coverage is 87.50%.

@@           Coverage Diff            @@
##           develop    #6339   +/-   ##
========================================
  Coverage    75.90%   75.90%           
========================================
  Files         1515     1515           
  Lines       164002   164023   +21     
========================================
+ Hits        124482   124499   +17     
- Misses       39520    39524    +4     

Impacted Files	Coverage Δ
src/ansi-c/ansi_c_language.cpp	97.53% <ø> (ø)
src/goto-cc/compile.h	100.00% <ø> (ø)
src/goto-cc/gcc_cmdline.cpp	74.60% <ø> (ø)
src/goto-cc/goto_cc_mode.cpp	36.58% <ø> (ø)
src/goto-cc/ms_cl_cmdline.cpp	0.00% <0.00%> (ø)
src/langapi/language.h	47.36% <ø> (ø)
src/langapi/language_file.cpp	70.87% <ø> (ø)
src/langapi/language_file.h	100.00% <ø> (ø)
src/statement-list/statement_list_language.cpp	67.30% <0.00%> (ø)
src/goto-programs/name_mangler.h	96.72% <66.66%> (-3.28%)	⬇️
... and 7 more

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[tautschnig]

Closing as this workflow is now supported via crangler (#6367).