Fix Linter warnings for inline calls with interface block imported from header with func.h suffix

[reuterbal]

Another beautiful edge case but this time purely in Linter recipes:

• apparently, interface blocks may not only be declared in .intfb.h headers, but also in .func.h headers
• inline calls with string parameters can actually be identified as inline calls (rather than array subscripts) by fparser

[github-actions]

Documentation for this branch can be viewed at https://sites.ecmwf.int/docs/loki/332/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.15%. Comparing base (b9be6f6) to head (b766924).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #332   +/-   ##
=======================================
  Coverage   95.15%   95.15%           
=======================================
  Files         168      168           
  Lines       35417    35432   +15     
=======================================
+ Hits        33700    33715   +15     
  Misses       1717     1717           

Flag	Coverage Δ
lint_rules	96.39% <100.00%> (+0.01%)	⬆️
loki	95.13% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mlange05]

Nifty Fparser trick! Looks clean and neat as always, GTG from me.