add support for targeting glibc 2.38

[nektro]

Previous release issue: #14798

glibc 2.38 was released. Time to follow the update procedure.

Major new features that may be relevant:

* Support for x86_64 running on Hurd has been added.  This port requires
  as least binutils 2.40 and GCC 13:

    - x86_64-gnu

* A new tunable, glibc.pthread.stack_hugetlb, can be used to disable
  Transparent Huge Pages (THP) in stack allocation at pthread_create.

* Vector math library libmvec support has been added to AArch64.  It
  requires GCC version >= 10.1.0.  It can be disabled via
  "--disable-mathvec", however that is not a supported configuration as
  it changes the ABI. The symbol names follow the AArch64 vector ABI,
  they are declared in math.h and have to be called manually at this point.

* The strlcpy and strlcat functions have been added.  They are derived
  from OpenBSD, and are expected to be added to a future POSIX version.

* libcrypt is no longer built by default; one may use the "--enable-crypt"
  option to build libcrypt.  libcrypt is likely to be removed from the
  GNU C Library in a future release, so it is recommended that
  applications port away from it to an alternative such as libxcrypt.