[Bug 277422] Fix build of tools/test/gpioevents

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277422

            Bug ID: 277422
           Summary: Fix build of tools/test/gpioevents
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: jfc@mit.edu

Created attachment 248857
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=248857&action=edit
Patch to fix compilation of gpioevents

tools/test/gpioevents has bit-rotted and triggers errors from clang 17.  Patch
attached.

Building /usr/obj/usr/src/arm64.aarch64/tools/test/gpioevents/gpioevents.o
/usr/src/tools/test/gpioevents/gpioevents.c:64:6: error: a function declaration
without a prototype is deprecated in all versions of C
[-Werror,-Wstrict-prototypes]
   64 | usage()
      |      ^
      |       void
/usr/src/tools/test/gpioevents/gpioevents.c:155:16: error: a function
declaration without a prototype is deprecated in all versions of C
[-Werror,-Wstrict-prototypes]
  155 | calc_utc_offset()
      |                ^
      |                 void
/usr/src/tools/test/gpioevents/gpioevents.c:213:35: error: variable length
array folded to constant array as an extension [-Werror,-Wgnu-folding-constant]
  213 |                 const struct gpio_event_summary sum[numrecs];
      |                                                 ^
/usr/src/tools/test/gpioevents/gpioevents.c:214:35: error: variable length
array folded to constant array as an extension [-Werror,-Wgnu-folding-constant]
  214 |                 const struct gpio_event_detail  det[numrecs];
      |                                                 ^
4 errors generated.
*** Error code 1

Stop.

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