Fix define_macros for Windows compatibility

Author: dahlia

setup.py

@@ -33,13 +33,15 @@
 
 if sys.platform == 'win32':
     warnings = ['-Wall']
+    macros = {'LIBSASS_PYTHON_VERSION': '\\"' + version + '\\"'}
 else:
     warnings = ['-Wall', '-Wno-parentheses', '-Wno-tautological-compare']
+    macros = {'LIBSASS_PYTHON_VERSION': '"' + version + '"'}
 
 sass_extension = Extension(
     'sass',
     ['sass.c'] + libsass_sources,
-    define_macros=[('LIBSASS_PYTHON_VERSION', '"' + version + '"')],
+    define_macros=macros.items(),
     depends=libsass_headers,
     extra_compile_args=['-c', '-O2', '-fPIC'] + warnings,
     extra_link_args=['-fPIC'],