Handle systems missing <sys/cdefs.h>

This is a non-portable header, and we cannot expect it to be provided by
the system libc (e.g. musl). We just need and rely on declaration that
we have defined ourselves in our own <bsd/sys/cdefs.h>. So we switch to
only ever assume that.

Fixes: https://bugs.freedesktop.org/105281

include/bsd/libutil.h

@@ -40,7 +40,11 @@
 #define LIBBSD_LIBUTIL_H
 
 #include <features.h>
+#ifdef LIBBSD_OVERLAY
 #include <sys/cdefs.h>
+#else
+#include <bsd/sys/cdefs.h>
+#endif
 #include <sys/types.h>
 #include <stdint.h>
 #include <stdio.h>