clang-13.0.1nb1 build from pkgsrc 2022Q2 fails on NetBSD-9.2_STABLE (2022-07-01)

[Matthias Petermann <mp%petermann-it.de@localhost>]

Hello,

After several retries, most recently with only one parallel make job, I
unfortunately now find that clang 13.0.1 does not build in my
environment, nor do a large number of packages that depend on it.
Unfortunately I can't do anything with the error description in the
build.log:

```
[ 76%] Building CXX object
lib/Testing/CMakeFiles/obj.clangTesting.dir/CommandLineArgs.cpp.o [
76%] Built target obj.clangTesting [ 76%] Building CXX object
lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/IncrementalExecutor.cpp.o
[ 76%] Building CXX object
lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/IncrementalParser.cpp.o
/tmp/work/clang-13.0.1.src/lib/Interpreter/IncrementalParser.cpp: In
lambda function:
/tmp/work/clang-13.0.1.src/lib/Interpreter/IncrementalParser.cpp:56:28:
error: 'state_not_recoverable' is not a member of 'std::errc'
std::errc::state_not_recoverable, ^~~~~~~~~~~~~~~~~~~~~ ***
[lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/IncrementalParser.cpp.o]
Error code 1

make[2]: stopped in /tmp/work/build
1 error

make[2]: stopped in /tmp/work/build
*** [lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/all] Error
code 2

make[1]: stopped in /tmp/work/build
1 error

make[1]: stopped in /tmp/work/build
*** [all] Error code 2

make: stopped in /tmp/work/build
1 error

make: stopped in /tmp/work/build
*** Error code 2

Stop.
make[1]: stopped in /usr/pkgsrc/lang/clang
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/lang/clang
```

Did anyone run into the same issue or is there a known workaround?

Kind regards
Matthias