src: fuzz_main.cpp: Fix includes

[jsmolic]

This fixes the following build issues:

fuzz_main.cpp:20:10: fatal error: ast/clang_parser.h: No such file or
directory
fuzz_main.cpp:25:10: fatal error: codegen_llvm.h: No such file or
director

Bug: https://bugs.gentoo.org/801385

Checklist

• Language changes are updated in man/adoc/bpftrace.adoc and if needed in docs/reference_guide.md
• User-visible and non-trivial changes updated in CHANGELOG.md
• The new behaviour is covered by tests

[jsmolic]

Compilation still fails with

src/fuzz_main.cpp:164:19: error: ‘class bpftrace::ast::SemanticAnalyser’ has no member named ‘create_maps’
  164 |   err = semantics.create_maps(true);

[fbs]

thanks!

we should really add this to the CI so we know it builds, else it will keep on breaking.

Can you fix the clang-formt issue in fuzz_main.c? Not sure why the others are in there as well, might be fixed after a rebase.

[jsmolic]

@fbs Thanks!