Fix regression on prefix/suffix for libraries

pylib/gyp/generator/ninja.py

Index: pylib/gyp/generator/ninja.py
===================================================================
--- pylib/gyp/generator/ninja.py	(revision 1205)
+++ pylib/gyp/generator/ninja.py	(working copy)
@@ -834,16 +834,16 @@
     # the product type.
     if self.flavor == 'win':
       DEFAULT_PREFIX = {
+        'loadable_module': '',
+        'shared_library': '',
+        'static_library': '',
+        }
+    else:
+      DEFAULT_PREFIX = {
         'loadable_module': 'lib',
         'shared_library': 'lib',
         'static_library': 'lib',
         }
-    else:
-      DEFAULT_PREFIX = {
-        'loadable_module': '',
-        'shared_library': '',
-        'static_library': '',
-        }
     prefix = spec.get('product_prefix', DEFAULT_PREFIX.get(type, ''))
 
     # Compute filename extension: the product extension, or a default