Polishing: eliminate warnings.

server-tools/instance-manager/Makefile.am:
  - replace -Wextra by -W for old compilers;
  - remove -Werror
server-tools/instance-manager/listener.cc:
  Use explicit cast to eliminate warning on Solaris.

server-tools/instance-manager/Makefile.am

@@ -61,7 +61,7 @@ client_settings.h:
 
 libexec_PROGRAMS= mysqlmanager
 
-mysqlmanager_CXXFLAGS=  -Wall -Wextra -Werror
+mysqlmanager_CXXFLAGS=  -Wall -W
 
 mysqlmanager_SOURCES=	command.cc command.h mysqlmanager.cc \
 			manager.h manager.cc log.h log.cc \

server-tools/instance-manager/listener.cc

@@ -213,7 +213,7 @@ int Listener::create_tcp_socket()
   {
     im_bind_addr= (ulong) inet_addr(Options::Main::bind_address);
 
-    if (im_bind_addr == INADDR_NONE)
+    if (im_bind_addr == (ulong) INADDR_NONE)
       im_bind_addr= htonl(INADDR_ANY);
   }
   else