usr.sbin/makefs: Add FAT support (taken from FreeBSD)

Basically same as FreeBSD version, except that several denode
functions (that makefs(8) is trying to override kernel ones using
the same name) h

usr.sbin/makefs: Add FAT support (taken from FreeBSD)

Basically same as FreeBSD version, except that several denode
functions (that makefs(8) is trying to override kernel ones using
the same name) have slightly different arguments in DragonFly.

This commit adds #ifdef MAKEFS here and there in
sys/vfs/msdosfs/*.h, which is the same in FreeBSD makefs(8).

FreeBSD makefs(8) now uses m_buf and m_vnode instead of overriding
kernel structs (using that they can't be included in userspace),
but DragonFly still uses buf and vnode defined in makefs(8).

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