Madvise

A library for mingw32 that includes some POSIX functions but eventually all of the POSIX functions will be completed and right now the POSIX functions that are included in this repository are pipe, wait, mmap, munmap, msync, mlock, munlock, posix_madvise, madvise, shm_open, shm_unlink, readv, writev, process_vm_readv, process_vm_writev, dlopen, etc