misc-utils: cleanup unused strings.h includes

Noticed on klibc building.

Signed-off-by: maximilian attems <max@stro.at>

misc-utils/kill.c

@@ -45,7 +45,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <strings.h>
 #include <ctype.h>		/* for isdigit() */
 #include <unistd.h>
 #include <signal.h>

misc-utils/logger.c

@@ -43,7 +43,6 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <string.h>
-#include <strings.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>

misc-utils/namei.c

@@ -24,7 +24,6 @@
 #include <unistd.h>
 #include <getopt.h>
 #include <string.h>
-#include <strings.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <sys/types.h>