Use GYP to generate MSVS project files

common.gypi

 {
   'variables': {
     'visibility%': 'hidden',
     'library%': 'static_library',
     'component%': '',
     'want_separate_host_toolset': 0,
   },
 
   'conditions': [
     ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
        or OS=="netbsd"', {
       'target_defaults': {
         'cflags': [ '-Wall', '-W', '-Wno-unused-parameter',
                     '-Wnon-virtual-dtor', '-pthread', '-fno-rtti',
                     '-pedantic',
                     # Ignore some warnings for googletest
                     '-Wno-error=long-long', '-Wno-error=variadic-macros',
                     '-Wno-error=missing-field-initializers' ],
         'ldflags': [ '-pthread', ],
       },
     }],
-  ]
+  ],
+
+  'target_defaults': {
+    'msvs_cygwin_shell': 0,
+    'conditions': [[
+      'target_arch=="x64"', {
+        'msvs_configuration_platform': 'x64',
+      }
+    ]],
+  }
 }