Add "standalone_static_library" flag

pylib/gyp/generator/msvs.py

Index: pylib/gyp/generator/msvs.py
===================================================================
--- pylib/gyp/generator/msvs.py	(revision 1508)
+++ pylib/gyp/generator/msvs.py	(working copy)
@@ -997,6 +997,7 @@
         'shared_library': '2',  # .dll
         'loadable_module': '2',  # .dll
         'static_library': '4',  # .lib
+        'standalone_static_library': '4', # .lib
         'none': '10',  # Utility type
         }[spec['type']]
   except KeyError:
@@ -1153,6 +1154,8 @@
       'shared_library': ('VCLinkerTool', 'Link', '$(OutDir)', '.dll'),
       'loadable_module': ('VCLinkerTool', 'Link', '$(OutDir)', '.dll'),
       'static_library': ('VCLibrarianTool', 'Lib', '$(OutDir)lib\\', '.lib'),
+      'standalone_static_library': ('VCLibrarianTool', 'Lib', '$(OutDir)lib\\',
+                                    '.lib'),
   }
   output_file_props = output_file_map.get(spec['type'])
   if output_file_props and int(spec.get('msvs_auto_output_file', 1)):
@@ -2618,6 +2621,7 @@
       'shared_library': 'Link',
       'loadable_module': 'Link',
       'static_library': 'Lib',
+      'standalone_static_library': 'Lib',
   }
   msbuild_tool = msbuild_tool_map.get(spec['type'])
   if msbuild_tool: