Include missing <string.h>

testsuites/libtests/block06/init.c

@@ -20,6 +20,7 @@
 #include <setjmp.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <inttypes.h>

testsuites/libtests/block08/bdbuf_tests.c

@@ -14,6 +14,7 @@
 #endif
 
 #include <stdio.h>
+#include <string.h>
 #include <errno.h>
 
 #include <rtems.h>

testsuites/libtests/block08/bdbuf_tests.h

@@ -13,6 +13,7 @@
 #define BDBUF_TESTS_H
 
 #include <stdio.h>
+#include <string.h>
 #include <errno.h>
 #include <rtems/diskdevs.h>
 #include <rtems/bdbuf.h>

testsuites/libtests/mghttpd01/test-http-client.c

@@ -19,6 +19,7 @@
 #include <netinet/tcp.h>
 #include <netdb.h>
 #include <unistd.h>
+#include <string.h>
 
 #include "test-http-client.h"