lib: set process.execPath on OpenBSD

PR-URL: #18543
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/bootstrap_node.js

@@ -66,6 +66,13 @@
     // URL::ToObject() method is used.
     NativeModule.require('internal/url');
 
+    // On OpenBSD process.execPath will be relative unless we
+    // get the full path before process.execPath is used.
+    if (process.platform === 'openbsd') {
+      const { realpathSync } = NativeModule.require('fs');
+      process.execPath = realpathSync.native(process.execPath);
+    }
+
     Object.defineProperty(process, 'argv0', {
       enumerable: true,
       configurable: false,