Fix C++23 build.

Mostly missing #includes, but some incomplete types given to
std::unique_ptr too.

Change-Id: I50583874dca32607eeb48b5d640822a3417ff530
diff --git a/init/capabilities.h b/init/capabilities.h
index fc80c98..b71d2cb 100644
--- a/init/capabilities.h
+++ b/init/capabilities.h
@@ -18,6 +18,7 @@
 #include <sys/capability.h>
 
 #include <bitset>
+#include <memory>
 #include <string>
 #include <type_traits>