Fix missing includes of <string.h>, to silence some compiler warnings.

Submitted by:	Pawel Worach

lib/libkvm/kvm_amd64.c

@@ -51,6 +51,7 @@ static char sccsid[] = "@(#)kvm_hp300.c	8.1 (Berkeley) 6/4/93";
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>

lib/libkvm/kvm_arm.c

@@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
 #include <limits.h>
 #include <kvm.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "kvm_private.h"

lib/libkvm/kvm_cptime.c

@@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
 #include <kvm.h>
 #include <limits.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "kvm_private.h"
 

lib/libkvm/kvm_file.c

@@ -61,6 +61,7 @@ static char sccsid[] = "@(#)kvm_file.c	8.1 (Berkeley) 6/4/93";
 #include <limits.h>
 #include <ndbm.h>
 #include <paths.h>
+#include <stdlib.h>
 
 #include "kvm_private.h"
 

lib/libkvm/kvm_i386.c

@@ -51,6 +51,7 @@ static char sccsid[] = "@(#)kvm_hp300.c	8.1 (Berkeley) 6/4/93";
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>

lib/libkvm/kvm_minidump_amd64.c

@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mman.h>
 #include <sys/fnv_hash.h>
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>

lib/libkvm/kvm_minidump_i386.c

@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mman.h>
 #include <sys/fnv_hash.h>
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
 #include <unistd.h>
 #include <nlist.h>
 #include <kvm.h>