make: unifdef for other OSes (undefined)

@@ -36,13 +36,10 @@
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/utsname.h>
 #include <rpc/rpc.h>            /* host2netname(), netname2host() */
-#ifdef linux
-#       include <unistd.h>      /* getdomainname() */
-#endif
 
 /*
  * Defined macros
  */
 

@@ -196,17 +193,12 @@
         local_host_wslen = wslen(local_host);
 
         // There is no getdomainname() function on Solaris.
         // And netname2host() function does not work on Linux.
         // So we have to use different APIs.
-#ifdef linux
-        if (getdomainname(mbs_buffer, MAXNETNAMELEN+1) == 0) {
-                sprintf(mbs_buffer2, "%s.%s", local_host_mb, mbs_buffer);
-#else
         if (host2netname(mbs_buffer, NULL, NULL) &&
             netname2host(mbs_buffer, mbs_buffer2, MAXNETNAMELEN+1)) {
-#endif
                 MBSTOWCS(full_host, mbs_buffer2);
                 full_host_wslen = wslen(full_host);
         }
 
         for (ms = make_machines_list;