nsresourced: fix build without libbpf

```
In file included from ../src/nsresourced/nsresourced-manager.c:9:
../src/shared/bpf-link.h:5:10: fatal error: bpf/libbpf.h: No such file or directory
    5 | #include <bpf/libbpf.h>
      |          ^~~~~~~~~~~~~~
```

Follow-up for 46718d344fdaaaf523d854a0c728197e7406a55a

diff --git a/src/nsresourced/nsresourced-manager.c b/src/nsresourced/nsresourced-manager.c
index 43a00d6cefdfc58688ca9c84f9f254f51d7e1c1c..ab1cd0a7c139cbef6d4b5257b83afa4480b0a01a 100644 (file)
--- a/src/nsresourced/nsresourced-manager.c
+++ b/src/nsresourced/nsresourced-manager.c
@@ -6,7 +6,9 @@
 #include "sd-daemon.h"
 
 #include "bpf-dlopen.h"
+#if HAVE_VMLINUX_H
 #include "bpf-link.h"
+#endif
 #include "build-path.h"
 #include "common-signal.h"
 #include "env-util.h"