tree-wide: drop capability.h when capability-util.h is included

src/basic/capability-util.c

@@ -4,7 +4,6 @@
 #include <grp.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/capability.h>
 #include <sys/prctl.h>
 #include <unistd.h>
 

src/core/execute.c

@@ -5,7 +5,6 @@
 #include <grp.h>
 #include <poll.h>
 #include <signal.h>
-#include <sys/capability.h>
 #include <sys/eventfd.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>

src/test/test-capability.c

@@ -2,7 +2,6 @@
 
 #include <netinet/in.h>
 #include <pwd.h>
-#include <sys/capability.h>
 #include <sys/prctl.h>
 #include <sys/socket.h>
 #include <sys/wait.h>

src/test/test-load-fragment.c

@@ -3,7 +3,6 @@
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdio.h>
-#include <sys/capability.h>
 #include <unistd.h>
 
 #include "all-units.h"