Merge "Fix mac build."

#include <unistd.h>

#if !defined(__MINGW32__)

#include <sys/mman.h>

#endif

#if defined(__APPLE__)

/* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */

static_assert(sizeof(off_t) >= 8, "This code requires that Mac OS have at least a 64-bit off_t.");

typedef off_t off64_t;

static inline void* mmap64(void* addr, size_t length, int prot, int flags, int fd, off64_t offset) {

    return mmap(addr, length, prot, flags, fd, offset);

}

static inline off64_t lseek64(int fd, off64_t offset, int whence) {

    return lseek(fd, offset, whence);

}