natPlainSocketImpl.cc: Don't include headers if java.net is disabled.

* java/net/natPlainSocketImpl.cc: Don't include headers if
	java.net is disabled.

From-SVN: r29812

libjava/java/net/natPlainSocketImpl.cc

@@ -8,6 +8,7 @@ details.  */
 
 #include <config.h>
 
+#ifndef DISABLE_JAVA_NET
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/time.h>
@@ -19,6 +20,7 @@ details.  */
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
+#endif /* DISABLE_JAVA_NET */
 
 #if HAVE_BSTRING_H
 // Needed for bzero, implicitly used by FD_ZERO on IRIX 5.2