AppleClang: Add flags for C17 and C23

Follow up commit 72f4984c (Clang: C23 support, 2021-02-07).
39 jobs for !6231 with c_17_23-AppleClang in 15 minutes and 51 seconds (queued for 4 seconds)
latest detached
Status Job ID Name Coverage
  Build
manual build:centos6-x86_64 #5881626
linux docker build cmake manual
manual build:fedora34-ninja #5881627
linux-3.17 linux docker build cmake manual
manual build:macos-x86_64-makefiles #5881629
nonconcurrent xcode-12.5 shell macos cmake manual
manual build:macos-x86_64-ninja #5881628
nonconcurrent xcode-12.5 shell macos cmake manual
manual build:windows-vs2019-x64-ninja #5881630
nonconcurrent msvc-19.29-16.10 vs2019 shell windows cmake manual
passed lint:codespell #5881622
docker build cmake linux

00:00:45

passed lint:debian10-iwyu #5881623
linux docker build cmake

00:02:13

passed lint:fedora34-sphinx #5881625
linux-3.17 linux docker build cmake

00:02:37

passed lint:fedora34-tidy #5881624
linux-3.17 linux docker build cmake

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  Test
created test:fedora34-ninja #5881631
x11 linux-3.17 linux docker cmake
created test:macos-x86_64-makefiles #5881633
nonconcurrent xcode-12.5 shell macos cmake
created test:macos-x86_64-ninja #5881632
nonconcurrent xcode-12.5 shell macos cmake
created test:windows-vs2019-x64-ninja #5881634
nonconcurrent msvc-19.29-16.10 vs2019 shell windows cmake
 
  Test Ext
created test:cuda10.2-nvidia #5881637
linux docker cuda-rt cmake
created test:debian10-ninja #5881635
linux-3.17 linux docker build cmake
created test:fedora34-makefiles #5881636
linux-3.17 linux docker build cmake
created test:fedora34-ninja-multi #5881638
linux-3.17 linux docker build cmake
created test:macos-x86_64-xcode #5881639
concurrent xcode-12.5 shell macos cmake
created test:windows-vs2019-x64 #5881640
concurrent msvc-19.29-16.10 vs2019 shell windows cmake
 
  External
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