slk.c still broken on some architecetures

[Paul Goyette <paul%whooppee.com@localhost>]

> Module Name:    src
> Committed By:   blymn
> Date:           Thu Jun 24 05:53:05 UTC 2021
>
> Modified Files:
>         src/lib/libcurses: slk.c
>
> Log Message:
> Make sure we don't use wide char routines when DISABLE_WCHAR is in
> effect.
>
>
> To generate a diff of this commit:
> cvs rdiff -u -r1.9 -r1.10 src/lib/libcurses/slk.c


Even with rev 1.10 of slk.c I am still seeing the following breakage
for dreamcast, evbsh3-eb, evbsh3-el, hpcsh, landisk, and mmeye.  I have
not tried all other architectures, but I did _not_ see this error on
cats.

dependall ===> lib/libcurses/PSD.doc
/build/netbsd-current/src_ro/lib/libcurses/slk.c: In function '__slk_wset':
/build/netbsd-current/src_ro/lib/libcurses/slk.c:571:52: error: format '%ld' expects argument of type 'long int', but argument 3 has type 'size_t' {aka 'unsigned int'} [-Werror=format=]
  571 |  __CTRACE(__CTRACE_INPUT, "__slk_wset: wcsrtombs %ld\n", len);
      |                                                  ~~^     ~~~
      |                                                    |     |
      |                                                    |     size_t {aka unsigned int}
      |                                                    long int
      |                                                  %d
cc1: all warnings being treated as errors
*** Failed target: slk.go
*** Failed commands:
        ${_MKTARGET_COMPILE}
        ${COMPILE.c} ${DEBUGFLAGS} ${COPTS.${.IMPSRC:T}} ${CPUFLAGS.${.IMPSRC:T}} ${CPPFLAGS.${.IMPSRC:T}} -g ${.IMPSRC} -o ${.TARGET}
*** [slk.go] Error code 1
nbmake[7]: stopped in /build/netbsd-current/src_ro/lib/libcurses
1 error


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