build: add shared library support to AIX build

Updates to build the shared library version of node on AIX. Adds the
same functionality to AIX that was added on Linux under this:

Ref: #6994

PR-URL: #9675
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>

configure

@@ -802,7 +802,14 @@ def configure_node(o):
   o['variables']['node_use_v8_platform'] = b(not options.without_v8_platform)
   o['variables']['node_use_bundled_v8'] = b(not options.without_bundled_v8)
   node_module_version = getmoduleversion.get_version()
-  shlib_suffix = '%s.dylib' if sys.platform == 'darwin' else 'so.%s'
+
+  if sys.platform == 'darwin':
+    shlib_suffix = '%s.dylib'
+  elif sys.platform.startswith('aix'):
+    shlib_suffix = '%s.a'
+  else:
+    shlib_suffix = 'so.%s'
+
   shlib_suffix %= node_module_version
   o['variables']['node_module_version'] = int(node_module_version)
   o['variables']['shlib_suffix'] = shlib_suffix

node.gyp

@@ -811,7 +811,15 @@
       'targets': [
         {
           'target_name': 'node',
-          'type': 'executable',
+          'conditions': [
+            ['node_shared=="true"', {
+              'type': 'shared_library',
+              'ldflags': ['--shared'],
+              'product_extension': '<(shlib_suffix)',
+            }, {
+              'type': 'executable',
+            }],
+          ],
           'dependencies': ['<(node_core_target_name)', 'node_exp'],
 
           'include_dirs': [