Fix build of appsec helper with llvm's linker

[cataphract]

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.02%. Comparing base (01b46dd) to head (80904a0).
Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3069      +/-   ##
============================================
- Coverage     74.77%   73.02%   -1.76%     
  Complexity     2787     2787              
============================================
  Files           112      139      +27     
  Lines         11033    15272    +4239     
  Branches          0     1043    +1043     
============================================
+ Hits           8250    11152    +2902     
- Misses         2783     3569     +786     
- Partials          0      551     +551     

Flag	Coverage Δ
appsec-extension	68.41% <ø> (?)
tracer-php	74.79% <ø> (+0.01%)	⬆️

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see 28 files with indirect coverage changes

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