Fix commit f3f814e622 that breaks the compilation on Windows.

Fiw also a minor compil warning

common/common.cpp

@@ -581,6 +581,7 @@ long long WX_FILENAME::GetTimestamp()
     return 0;
 }
 
+#ifndef __WINDOWS__
 
 //
 // A version of wxDir which avoids expensive calls to wxFileName::wxFileName().
@@ -650,4 +651,4 @@ bool WX_DIR::GetNext(wxString *filename) const
 
     return true;
 }
-
+#endif

include/common.h

@@ -37,6 +37,7 @@
 #include <wx/wx.h>
 #include <wx/confbase.h>
 #include <wx/fileconf.h>
+#include <wx/dir.h>
 
 #include <richio.h>
 #include <gal/color4d.h>

pcbnew/legacy_plugin.cpp

@@ -3195,8 +3195,8 @@ LP_CACHE::LP_CACHE( LEGACY_PLUGIN* aOwner, const wxString& aLibraryPath ) :
     m_owner( aOwner ),
     m_lib_path( aLibraryPath ),
     m_writable( true ),
-    m_cache_timestamp( 0 ),
-    m_cache_dirty( true )
+    m_cache_dirty( true ),
+    m_cache_timestamp( 0 )
 {
 }