[boost] [interprocess] Platform-specific flags for mapped_region

Hi, I wanted to try using Linux huge pages in my application, which uses Boost.Interprocess currently for interprocess communication. However there seems to be no way to pass MAP_HUGETLB flag to mmap in the interface of mapped_region. I understand that this is a platform-specific option, so probably it would be best to just add an opaque unsigned int flags parameter to the mapped_region constructor with the default value of 0. Or is there a better way of doing this? I'll create a ticket for this feature, but I wanted to know if the general idea of this extension is welcome.