Merge pull request #150 from luislavena/mingw-no-visibility

visibility=hidden should not be used for Windows

diff --cc configure.py
index f9c7077,e9b37b2..fbcdeb3
--- 1/configure.py
--- 2/configure.py
+++ b/configure.py
@@@ -82,9 -82,10 +82,10 @@@ ldflags = ['-L$builddir'
  libs = []
  
  if platform == 'mingw':
+     cflags.remove('-fvisibility=hidden');
      cflags.append('-Igtest-1.6.0/include')
      ldflags.append('-Lgtest-1.6.0/lib/.libs')
 -    ldflags.extend(['-static-libgcc', '-static-libstdc++'])
 +    ldflags.extend(['-static'])
  else:
      if options.profile == 'gmon':
          cflags.append('-pg')