setup: kill pure hack for osutil on Windows for Python 2.4

see e1fb276d4619

setup.py

@@ -505,13 +505,9 b' osutil_ldflags = []'
 if sys.platform == 'darwin':
     osutil_ldflags += ['-framework', 'ApplicationServices']
 
-# disable osutil.c under windows + python 2.4 (issue1364)
-if sys.platform == 'win32' and sys.version_info < (2, 5, 0, 'final'):
-    pymodules.append('mercurial.pure.osutil')
-else:
-    extmodules.append(Extension('mercurial.osutil', ['mercurial/osutil.c'],
-                                extra_link_args=osutil_ldflags,
-                                depends=common_depends))
+extmodules.append(Extension('mercurial.osutil', ['mercurial/osutil.c'],
+                            extra_link_args=osutil_ldflags,
+                            depends=common_depends))
 
 try:
     from distutils import cygwinccompiler