[Bug cli/34514] New: cli-style.c build failure (error: conversion from ‘const char 8_t [8]’ to non-scalar type ‘std::string ’ {aka ‘std::__cxx11::basic_string<char> ’} requested)

https://sourceware.org/bugzilla/show_bug.cgi?id=34514

            Bug ID: 34514
           Summary: cli-style.c build failure (error: conversion from
                    ‘const char8_t [8]’ to non-scalar type ‘std::string’
                    {aka ‘std::__cxx11::basic_string<char>’} requested)
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: sam at gentoo dot org
                CC: vries at gcc dot gnu.org
  Target Milestone: ---

This is from GCC trunk, but it happens with 16 too, as it defaults to
-std=gnu++20:
```
$ x86_64-pc-linux-gnu-g++ -x c++    -I. -I. -I./config -include ./defs.h
-DLOCALEDIR="\"/usr/share/locale\"" -DHAVE_CONFIG_H -I./../include/opcode
-I../bfd -I./../bfd -I./../include    -I../libdecnumber -I./../libdecnumber 
-I./../gnulib/import -I../gnulib/import -I./.. -I.. -I./../libbacktrace/
-I../libbacktrace/ -DTUI=1    -I/usr/include/python3.14
-I/usr/include/python3.14   -I./.. -pthread    -Wall -Wdangling-reference
-Wdeprecated-copy -Wdeprecated-copy-dtor -Wduplicated-cond -Wempty-body
-Wimplicit-fallthrough=5 -Wmissing-declarations -Wno-char-subscripts
-Wno-mismatched-tags -Wno-sign-compare -Wno-error=maybe-uninitialized
-Wno-switch -Wno-unused -Wpointer-arith -Wredundant-move -Wshadow=local
-Wstrict-null-sentinel -Wsuggest-override -Wunused-but-set-parameter
-Wunused-but-set-variable -Wunused-const-variable=1 -Wunused-function
-Wunused-label -Wunused-local-typedefs -Wunused-value -Wunused-variable -Wvla
-Wformat -Wformat-nonliteral  -O3 -march=native -flto=jobserver
-fno-semantic-interposition -ggdb3 -pipe -fcf-protection=none
-fdiagnostics-color=always -fdiagnostics-urls=never -frecord-gcc-switches
-fdiagnostics-show-context=3 --param=ggc-min-expand=120 -Wstrict-aliasing
-Wfree-nonheap-object -Wuninitialized -Wmaybe-uninitialized -Wreturn-type
-Werror=lto-type-mismatch -Werror=strict-aliasing -Werror=odr -Warray-bounds
-Wstringop-overread -Wstringop-overflow -Wstringop-truncation -Wformat-overflow
-Wformat-truncation -Wrestrict -ggdb3  -c -o cli/cli-style.o -MT
cli/cli-style.o -MMD -MP -MF cli/.deps/cli-style.Tpo cli/cli-style.c
cli/cli-style.c:457:37: error: conversion from ‘const char8_t [8]’ to
non-scalar type ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’}
requested
  457 | static std::string warning_prefix = u8"\u26A0\uFE0F ";
      |                                     ^~~~~~~~~~~~~~~~~
cli/cli-style.c:482:35: error: conversion from ‘const char8_t [5]’ to
non-scalar type ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’}
requested
  482 | static std::string error_prefix = u8"\u274C ";
```

-std=gnu++17 works fine.

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