all: remove unnecessary <netinet/ether.h> includes

<netinet/ether.h> with musl defines ethhdr struct, which conflicts
with <linux/if_ether.h>. The latter is included by "nm-utils.h",
so this is a problem.

Drop includes of "netinet/ether.h" that are not necessary.

clients/cli/connections.c

@@ -11,7 +11,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <signal.h>
-#include <netinet/ether.h>
 #include <readline/readline.h>
 #include <readline/history.h>
 #include <fcntl.h>

shared/n-dhcp4/src/test-run-client.c

@@ -11,7 +11,6 @@
 #include <errno.h>
 #include <getopt.h>
 #include <net/if.h>
-#include <netinet/ether.h>
 #include <netinet/in.h>
 #include <poll.h>
 #include <stdbool.h>

src/initrd/tests/test-cmdline-reader.c

@@ -8,7 +8,6 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <unistd.h>
-#include <netinet/ether.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>

src/initrd/tests/test-dt-reader.c

@@ -8,7 +8,6 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <unistd.h>
-#include <netinet/ether.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>

src/initrd/tests/test-ibft-reader.c

@@ -8,7 +8,6 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <unistd.h>
-#include <netinet/ether.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>

src/systemd/src/libsystemd-network/network-internal.c

@@ -4,7 +4,6 @@
 
 #include <arpa/inet.h>
 #include <linux/if.h>
-#include <netinet/ether.h>
 
 #include "sd-id128.h"
 #include "sd-ndisc.h"

src/tests/test-core-with-expect.c

@@ -6,7 +6,6 @@
 #include "nm-default.h"
 
 #include <time.h>
-#include <netinet/ether.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <fcntl.h>