C library: handle side effects of scanf

[tautschnig]

Please review commit-by-commit.

• Each commit message has a non-empty body, explaining why the change was made.
• 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.
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[codecov]

Codecov Report

Base: 78.34% // Head: 78.35% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (a165746) compared to base (a53fa0f).
Patch coverage: 94.17% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7369      +/-   ##
===========================================
+ Coverage    78.34%   78.35%   +0.01%     
===========================================
  Files         1644     1645       +1     
  Lines       190313   190190     -123     
===========================================
- Hits        149097   149031      -66     
+ Misses       41216    41159      -57     

Impacted Files	Coverage Δ
jbmc/src/janalyzer/janalyzer_parse_options.cpp	48.58% <ø> (ø)
.../src/java_bytecode/character_refine_preprocess.cpp	54.27% <ø> (ø)
...mc/src/java_bytecode/character_refine_preprocess.h	100.00% <ø> (ø)
jbmc/src/java_bytecode/ci_lazy_methods.h	100.00% <ø> (ø)
jbmc/src/java_bytecode/ci_lazy_methods_needed.cpp	98.41% <ø> (ø)
jbmc/src/java_bytecode/ci_lazy_methods_needed.h	100.00% <ø> (ø)
jbmc/src/java_bytecode/code_with_references.cpp	84.61% <ø> (ø)
jbmc/src/java_bytecode/java_bmc_util.cpp	100.00% <ø> (ø)
...mc/src/java_bytecode/java_bytecode_convert_class.h	0.00% <ø> (ø)
...src/java_bytecode/java_bytecode_convert_method.cpp	97.69% <ø> (ø)
... and 425 more

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