Remove warnings from test:
Remove warnings from test:

Reduces

```
[ RUN      ] clang_parser.redefined_types
definitions.h:2:16: warning: expected ';' at end of declaration list
definitions.h:3:8: error: redefinition of 'a'
definitions.h:2:8: note: previous definition is here
definitions.h:3:16: warning: expected ';' at end of declaration list
ERROR: Try running with --btf to force BTF processing or include headers with missing type definitions
ERROR: Try running with --btf to force BTF processing or include headers with missing type definitions
definitions.h:2:16: warning: expected ';' at end of declaration list
definitions.h:3:8: error: redefinition of 'a'
definitions.h:2:8: note: previous definition is here
```

Into

```
definitions.h:3:8: error: redefinition of 'a'
definitions.h:2:8: note: previous definition is here
ERROR: Try running with --btf to force BTF processing or include headers with missing type definitions
definitions.h:3:8: error: redefinition of 'a'
definitions.h:2:8: note: previous definition is here
ERROR: Try running with --btf to force BTF processing or include headers with missing type definitions
```

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace