* lib/fenv.in.h (fesetexcept): New declaration.
* lib/fenv-except-tracking-set.c: New file, based on glibc.
* lib/fenv-private.h (_GETMSR, _SETMSR, MSR_FP_EXC_MASK, PR_SET_FPEXC,
PR_FP_EXC_DISABLED, PR_FP_EXC_NONRECOV, PR_FP_EXC_ASYNC,
PR_FP_EXC_PRECISE, prctl) [NetBSD/powerpc]: New macros.
* m4/fenv-exceptions-tracking-c23.m4: New file.
* modules/fenv-exceptions-tracking-c23: New file.
* doc/posix-functions/fesetexcept.texi: Mention the new module and the
glibc bugs.