Segfault on C++ errors

[maleadt]

With the error in #1, CppInterop simply segfaults when it fails:

julia> Cpp.Declare("""
       #include <iostream>
       #include <vector>
       """)
In file included from <<< inputs >>>:1:
In file included from input_line_2:1:
In file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/iostream:41:
In file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/ostream:40:
In file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/ios:40:
In file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/iosfwd:42:
In file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/postypes.h:40:
In file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/cwchar:44:
/usr/include/wchar.h:35:10: fatal error: 'stddef.h' file not found
   35 | #include <stddef.h>
      |          ^~~~~~~~~~

[8190] signal 11 (1): Segmentation fault
in expression starting at REPL[6]:1
_ZN5clang4Decl22getTranslationUnitDeclEv at /home/tim/.julia/artifacts/69dcbef0a6538dfad50207efd8520cb42b8b945d/lib/libclang-cpp.so (unknown line)
Allocations: 3068679 (Pool: 3067893; Big: 786); GC: 4

[Gnimuc]

This is fixed in the upstream, see compiler-research/CppInterOp#306 (comment)