add field for kvm descriptor.

* glibtop_machine.h: add field for kvm descriptor.

        * open.c: add code for opening kernel name space.

        * shm_limits.c: implemented.

The real implementation will have this code in the daemon, since process
needs to be setgid sys to be able to read kernel symbols.

sysdeps/solaris/open.c

@@ -60,6 +60,10 @@ glibtop_open_s (glibtop *server, const char *program_name,
     if (!server->machine.kc)
 	glibtop_error_io_r (server, "kstat_open ()");
 
+    server->machine.kd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
+    if(!server->machine.kd)
+        glibtop_warn_io_r(server, "kvm_open()");
+
     fprintf (stderr, "Sleeping 2 seconds, please wait ...\n");
     sleep (2);
 }