add support for targeting glibc 2.36

[nektro]

Previous release issue: #12808

glibc 2.36 was released. Time to follow the update procedure.

Major new features that may be relevant:

* Support for DT_RELR relative relocation format has been added to
  glibc.  This is a new ELF dynamic tag that improves the size of
  relative relocations in shared object files and position independent
  executables (PIE).  DT_RELR generation requires linker support for
  -z pack-relative-relocs option, which is supported for some targets
  in recent binutils versions.  Lazy binding doesn't apply to DT_RELR.

* Support for LoongArch running on Linux has been added.  This port requires
  as least binutils 2.38, GCC 12, and Linux 5.19.  Currently only hard-float
  ABI is supported:

    - loongarch64-linux-gnu

  The LoongArch ABI is 64-bit little-endian.

[motiejus]

Ditto as #12808 (comment):

If someone is working on this, please, let's refrain from merging a new glibc until we have a stable nightly build. glibc header upgrades tend to add to the instability.