[bug #62540] refer/ref.cpp: comparison between two arrays is deprecated in C++20

[Bjarni Ingi Gislason]

Follow-up Comment #2, bug #62540 (project groff):

g++ is (Debian 12.1.0-2) 12.1.0

GNU Troff version 1.22.4.4708-3fdde
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 installation prefix              : /usr/local
 C++ compiler                     : g++ -Walloc-zero -Walloca -Wall
-Wextra -Wformat=2 -Wattribute-warning -Wdate-time -Wfree-nonheap-object
-Wimplicit-fallthrough=3 -Wmaybe-uninitialized -Wstringop-overflow=4
-Wredundant-decls -Wshadow=global -Wuninitialized -Wunused
-Wunused-parameter -Wvla -fdiagnostics-generate-patch -fsanitize=bool
-fsanitize=enum -fsanitize=signed-integer-overflow
-fsanitize-undefined-trap-on-error -O2 -fstack-protector-strong
-fno-common -fstack-clash-protection -ftrapv -funsigned-char
-fvar-tracking-assignments -ggdb3  -fcheck-new -Wmismatched-new-delete
-Wmissing-requires -Wredundant-decls -Wdelete-incomplete -std=c++23 
-D_FORTIFY_SOURCE=2 -DGCC_LINT
 use libgroff's memory allocator  : no
 C compiler                       : /usr/bin/gcc-12 -Walloc-zero
-Walloca -Wall -Wextra -Wformat=2 -Wattribute-warning -Wdate-time
-Wfree-nonheap-object -Wimplicit-fallthrough=3 -Wmaybe-uninitialized
-Wstringop-overflow=4 -Wredundant-decls -Wshadow=global
-Wuninitialized -Wunused -Wunused-parameter -Wvla
-fdiagnostics-generate-patch -fsanitize=bool -fsanitize=enum
-fsanitize=signed-integer-overflow -fsanitize-undefined-trap-on-error
-O2 -fstack-protector-strong -fno-common -fstack-clash-protection
-ftrapv -funsigned-char -fvar-tracking-assignments -ggdb3 
-Wmissing-prototypes -Wold-style-definition -Wstrict-prototypes 
-Wold-style-declaration  -std=c2x  -D_FORTIFY_SOURCE=2 -DGCC_LINT
 Perl interpreter version         : 5.34.0
 X11 support                      : enabled
 X11 app defaults directory       : /usr/local/lib/X11/app-defaults
 'groff -l' uses print spooler    : no
 use URW fonts for PDF output     : yes
 preconv can use uchardet library : yes
 tests can use PDF tools          : yes
----------------------------------------------------------------------




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