[Bug 254259] make buildworld fails in rescue.c

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254259

            Bug ID: 254259
           Summary: make buildworld fails in rescue.c
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: shurd at FreeBSD.org

Doing a source upgrade on a system with 13.0-CURRENT r339441 to 13c22f749
(releng/13.0), buildworld fails with -Werror warnings in rescue.c, mostly
related to missing void parameter.

rescue.c:46:13: error: this function declaration is not a prototype
[-Werror,-Wstrict-prototypes]
rescue.c:79:1: error: no previous prototype for function 'crunched_main'
[-Werror,-Wmissing-prototypes]
crunched_main(int argc, char **argv, char **envp)

But also some unused variables:
rescue.c:82:18: error: unused variable 'ep' [-Werror,-Wunused-variable]
    struct stub *ep;
rescue.c:83:9: error: unused variable 'columns' [-Werror,-Wunused-variable]
    int columns, len;
rescue.c:83:18: error: unused variable 'len' [-Werror,-Wunused-variable]
    int columns, len;

My assumption is that this is due to /usr/bin/crunchgen being used instead of a
newly built crunchgen, I've built the new crunchgen and replaced
/usr/bin/crunchgen with it to test this theory, and will update this PR when I
have a result.

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