tree-wide: drop string.h when string-util.h or friends are included

src/libsystemd-network/dhcp-option.c

@@ -6,7 +6,6 @@
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <string.h>
 
 #include "alloc-util.h"
 #include "dhcp-internal.h"

src/libsystemd-network/dhcp6-option.c

@@ -5,7 +5,6 @@
 
 #include <errno.h>
 #include <netinet/in.h>
-#include <string.h>
 
 #include "sd-dhcp6-client.h"
 

src/libsystemd-network/sd-dhcp-client.c

@@ -8,7 +8,6 @@
 #include <net/if_arp.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <sys/ioctl.h>
 #include <linux/if_infiniband.h>
 

src/libsystemd-network/sd-dhcp-lease.c

@@ -7,7 +7,6 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>

src/libsystemd-network/sd-dhcp6-client.c

@@ -4,7 +4,6 @@
 ***/
 
 #include <errno.h>
-#include <string.h>
 #include <sys/ioctl.h>
 #include <linux/if_arp.h>
 #include <linux/if_infiniband.h>

src/libsystemd-network/sd-ipv4acd.c

@@ -8,7 +8,6 @@
 #include <netinet/if_ether.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 
 #include "sd-ipv4acd.h"
 

src/libsystemd-network/sd-ipv4ll.c

@@ -7,7 +7,6 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 
 #include "sd-id128.h"
 #include "sd-ipv4acd.h"

src/libsystemd-network/test-lldp.c

@@ -4,7 +4,6 @@
 #include <errno.h>
 #include <net/ethernet.h>
 #include <stdio.h>
-#include <string.h>
 #include <unistd.h>
 
 #include "sd-event.h"