8227737: avoid implicit-function-declaration on AIX

Reviewed-by: clanger, goetz

src/java.base/unix/native/libjava/childproc.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -26,6 +26,7 @@
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>

src/java.base/unix/native/libnet/NetworkInterface.c

@@ -34,6 +34,7 @@
 #include <netinet/in6_var.h>
 #include <sys/ndd_var.h>
 #include <sys/kinfo.h>
+#include <strings.h>
 #endif
 
 #if defined(__solaris__)

src/java.base/unix/native/libnio/ch/FileChannelImpl.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -32,6 +32,7 @@
 #if defined(__linux__) || defined(__solaris__)
 #include <sys/sendfile.h>
 #elif defined(_AIX)
+#include <string.h>
 #include <sys/socket.h>
 #elif defined(_ALLBSD_SOURCE)
 #include <sys/socket.h>

src/java.base/unix/native/libnio/ch/Net.c

@@ -42,6 +42,7 @@
 #include "nio.h"
 
 #ifdef _AIX
+#include <stdlib.h>
 #include <sys/utsname.h>
 #endif