xmlLineNumbersDefault and xmlParseMemory functions are declared in libxml/parser.h, which in turn was not included in main/selectors.c, adding it to prevent compiler warnings and errors.

[leleliu008]

https://github.com/universal-ctags/ctags/issues/3851

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5a65c08) 85.02% compared to head (41641b7) 85.02%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3853 +/- ## ======================================= Coverage 85.02% 85.02% ======================================= Files 228 228 Lines 53901 53901 ======================================= Hits 45832 45832 Misses 8069 8069 ```

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