[Bug 196622] vm_map.h defines "min_offset" and "max_offset" which causes namespace pollution.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196622

            Bug ID: 196622
           Summary: vm_map.h defines "min_offset" and "max_offset" which
                    causes namespace pollution.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tjj5036 at gmail.com

In vm_map.h, there is a struct called vm_map that has two members named
min_offset and max_offset respectively. There are macros that define these two
to header.start and header.end respectively. Unfortunately, if you include
vm_map.h anywhere, it causes issues with anything also declared to be min_/max_
offset. ZFS actually undefines them. This fix would remove the defines, making
it so you can include the header safely without fear of unexpected bugs.

Environment:
FreeBSD 11.0-CURRENT

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