Fix build on Win32

src/mirall/owncloudpropagator.cpp

@@ -45,6 +45,8 @@
 #include <winbase.h>
 #endif
 
+#include <time.h>
+
 // We use some internals of csync:
 extern "C" int c_utimes(const char *, const struct timeval *);
 extern "C" void csync_win32_set_file_hidden( const char *file, bool h );