OSX in6_addr no longer generates compilable code after commit aa5f250

[Alison Gravley]

I meant to send this months ago, but after commit
aa5f25003554dffa18289f1be535ea23f75c29c3, which is from January 18, 2024, I
can no longer use this tool on OSX (Arm) as the generated wrapper for in6
is invalid and cannot compile. I think the commit after this one is where
the "--source" flag was removed.

Basically, there are "unnamed at
/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk/usr/include/netinet6/in6.h:153:2"
within the generated java that does not allow it to compile.

I am not able to share the 3rd party library that I am using jextract on
due to licensing, but in.h is from the OS. I am assuming this is being
generated due to the library including these:

```
#include <signal.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <netdb.h>
```

Back in January, the generated in6_addr.java looked like this:

```
import java.lang.invoke.MethodHandle;
import java.lang.invoke.VarHandle;
import java.nio.ByteOrder;
import java.lang.foreign.*;
import static java.lang.foreign.ValueLayout.*;
/**
 * {@snippet :
 * struct in6_addr {
 *     union  __u6_addr;
 * };
 * }
 */
public class in6_addr {

    public static MemoryLayout $LAYOUT() {
        return constants$41.const$0;
    }
    /**
     * {@snippet :
     * union {
     *     unsigned char __u6_addr8[16];
     *     unsigned short __u6_addr16[8];
     *     unsigned int __u6_addr32[4];
     * };
     * }
     */
    public static final class __u6_addr {

        // Suppresses default constructor, ensuring non-instantiability.
        private __u6_addr() {}
        public static MemoryLayout $LAYOUT() {
            return constants$41.const$1;
        }
        public static MemorySegment __u6_addr8$slice(MemorySegment seg) {
            return seg.asSlice(0, 16);
        }
        public static MemorySegment __u6_addr16$slice(MemorySegment seg) {
            return seg.asSlice(0, 16);
        }
        public static MemorySegment __u6_addr32$slice(MemorySegment seg) {
            return seg.asSlice(0, 16);
        }
        public static long sizeof() { return $LAYOUT().byteSize(); }
        public static MemorySegment allocate(SegmentAllocator allocator) {
return allocator.allocate($LAYOUT()); }
        public static MemorySegment allocateArray(long len,
SegmentAllocator allocator) {
            return allocator.allocate(MemoryLayout.sequenceLayout(len,
$LAYOUT()));
        }
        public static MemorySegment ofAddress(MemorySegment addr, Arena
scope) { return RuntimeHelper.asArray(addr, $LAYOUT(), 1, scope); }
    }

    public static MemorySegment __u6_addr$slice(MemorySegment seg) {
        return seg.asSlice(0, 16);
    }
    public static long sizeof() { return $LAYOUT().byteSize(); }
    public static MemorySegment allocate(SegmentAllocator allocator) {
return allocator.allocate($LAYOUT()); }
    public static MemorySegment allocateArray(long len, SegmentAllocator
allocator) {
        return allocator.allocate(MemoryLayout.sequenceLayout(len,
$LAYOUT()));
    }
    public static MemorySegment ofAddress(MemorySegment addr, Arena scope)
{ return RuntimeHelper.asArray(addr, $LAYOUT(), 1, scope); }
}
```

Now I get lines like this in the generated java. I attached the full
version:
private static final GroupLayout $LAYOUT = MemoryLayout.structLayout(
        in6_addr.union (unnamed at /Library/Developer/CommandLineTools/SDKs/
MacOSX14.sdk/usr/include/netinet6/in6.h:153:2).layout()
.withName("__u6_addr")
    ).withName("in6_addr");
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