src: add fcntl.h include to node.cc

#11863 adds _O_RDWR to node.cc
which is defined in fcntl.h. This adds this include directly to
node.cc.

PR-URL: #12540
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Gibson Fahnestock <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Myles Borins <[email protected]>

Author: bzoz

src/node.cc

@@ -73,6 +73,7 @@
 #endif
 
 #include <errno.h>
+#include <fcntl.h>. // _O_RDWR
 #include <limits.h>  // PATH_MAX
 #include <locale.h>
 #include <signal.h>