chore: add generated FFI header directories to .gitignore

[xdustinface]

They show up after every build now after #579.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: d4202893-e59b-428a-8ed4-36639d621d85

📥 Commits

Reviewing files that changed from the base of the PR and between 2f22194 and 39370a6.

📒 Files selected for processing (1)

• .gitignore

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/gitignore-ffi-headers

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.03%. Comparing base (2f22194) to head (39370a6).
⚠️ Report is 1 commits behind head on v0.42-dev.

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #603      +/-   ##
=============================================
- Coverage      67.03%   67.03%   -0.01%     
=============================================
  Files            320      320              
  Lines          67249    67249              
=============================================
- Hits           45083    45080       -3     
- Misses         22166    22169       +3     

Flag	Coverage Δ
core	75.21% <ø> (ø)
ffi	35.47% <ø> (ø)
rpc	19.92% <ø> (ø)
spv	83.75% <ø> (-0.03%)	⬇️
wallet	66.63% <ø> (ø)
see 3 files with indirect coverage changes