Libgloss build issue with GCC16 for arc target

[Nik Spaun]

Hello,

The crosstool-ng project is adding GCC16 support and has encountered an issue with the newlib build for the arc target (arc-multilib-elf32).
The problem is the generated assembly instructions:
GCC 16 can compile the hostlink buffer copy in _hl_pack_ptr into an ARC uncached byte store with a register-indexed address:

    stb.di r2,[r13,r1]

binutils rejects that instruction for ARC EM/HS targets, breaking the
arc-multilib-elf32 build while compiling libgloss/arc/hl/hl_api.c.

The attached patch fixes the issue, but I'm not sure if it's the best solution.

The failing crosstool-ng CI job is here https://github.com/crosstool-ng/crosstool-ng/actions/runs/25193796890/job/74152179593?pr=2502

WBR,
Nik
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