can't set the c++ standard correctly with newer versions of nvc++

[kjmeagher]

Describe the bug
When you try to set cpp_std in the normal way meson errors out without event trying.
nvc++ claims that it supports the following strings -std=c89|c90|c99|c11|c17|c18|gnu90|gnu89|gnu99|gnu11|gnu17|gnu18|c++98|c++03|c++11|c++14|c++17|c++20|c++23|gnu++98|gnu++03|gnu++11|gnu++14|gnu++17|gnu++20

To Reproduce
meson.build project('X', 'cpp', default_options: ['cpp_std=c++23'])
run with CXX=nvc++ meson setup build
which outpts meson.build:1:0: ERROR: None of values ['c++23'] are supported by the C++ compiler. Possible values are ['none']

Expected behavior
everything should be build with -std=c++23

system parameters

• Is this a cross build or just a plain native build (for the same computer)? No
• what operating system (e.g. MacOS Catalina, Windows 10, CentOS 8.0, Ubuntu 18.04, etc.) CentOS Linux 7
• what Python version are you using e.g. 3.8.0: Python 3.11.3
• what meson --version 1.4.1
• what ninja --version if it's a Ninja build. 1.11.1