- Remove socket file operations declaration from sys/file.h.
- Make them static in sys_socket.c.
- Provide generic invfo_truncate() instead of soo_truncate().

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git-svn-id: svn+ssh://svn.freebsd.org/base/head@270664 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f