process: make execve's args argument optional

Align the code with the documentation and similar methods used to
execute os commands - the `args` argument should be optional, and if
omitted, treated as an empty array (`[]`).

Fixes: https://github.com/nodejs/node/issues/58411
PR-URL: https://github.com/nodejs/node/pull/58412
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Richard Lau <richard.lau@ibm.com>

node.gyp

@@ -1338,6 +1338,13 @@
         }],
       ]
     }, # overlapped-checker
+    {
+      'target_name': 'nop',
+      'type': 'executable',
+      'sources': [
+        'test/nop/nop.c',
+      ]
+    }, # nop
     {
       'target_name': 'node_js2c',
       'type': 'executable',