zos: add search locations for libnode.x

Node.js on z/OS uses shared dll (libnode.so). When linking native
addons, node-gyp needs to find the corresponding libnode.x during
the link step.

PR-URL: #1451
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Refael Ackermann <refack@gmail.com>

lib/configure.js

@@ -244,25 +244,29 @@ function configure (gyp, argv, callback) {
       argv.push('-I', config)
     })
 
-    // for AIX we need to set up the path to the exp file
-    // which contains the symbols needed for linking.
-    // The file will either be in one of the following
-    // depending on whether it is an installed or
-    // development environment:
-    //  - the include/node directory
-    //  - the out/Release directory
-    //  - the out/Debug directory
-    //  - the root directory
+    // For AIX and z/OS we need to set up the path to the exports file
+    // which contains the symbols needed for linking. 
     var node_exp_file = undefined
     if (process.platform === 'aix' || process.platform === 'os390') {
       var ext = process.platform === 'aix' ? 'exp' : 'x'
       var node_root_dir = findNodeDirectory()
-      var candidates = ['include/node/node',
-                        'out/Release/node',
-                        'out/Debug/node',
-                        'node'].map(function(file) {
-                          return file + '.' + ext
-                        })
+      var candidates = undefined 
+      if (process.platform === 'aix') {
+        candidates = ['include/node/node',
+                      'out/Release/node',
+                      'out/Debug/node',
+                      'node'
+                     ].map(function(file) {
+                       return file + '.' + ext
+                     })
+      } else {
+        candidates = ['out/Release/obj.target/libnode',
+                      'out/Debug/obj.target/libnode',
+                      'lib/libnode'
+                     ].map(function(file) {
+                       return file + '.' + ext
+                     })
+      }
       var logprefix = 'find exports file'
       node_exp_file = findAccessibleSync(logprefix, node_root_dir, candidates)
       if (node_exp_file !== undefined) {