Check C++11 flags in mingw32 compiler

Author: isuruf

setup.py

@@ -78,7 +78,7 @@ class BuildExt(build_ext):
     def build_extensions(self):
         ct = self.compiler.compiler_type
         opts = self.c_opts.get(ct, [])
-        if ct == 'unix':
+        if ct in ['unix', 'mingw32']:
             opts.append('-DVERSION_INFO="%s"' % self.distribution.get_version())
             opts.append(cpp_flag(self.compiler))
             if has_flag(self.compiler, '-fvisibility=hidden'):