vim-patch:9.2.0547: "%v" in 'errorformat' is affected by 'tabstop' (#40040)

Problem:  The "%v" item in 'errorformat' interprets the reported
          screen column using the buffer's 'tabstop', so the cursor
          jumps to the wrong column when 'tabstop' is not 8
          (vimpostor).
Solution: When resolving a "%v" column, always count a <tab> as 8
          screen columns, independent of 'tabstop', matching the
          column numbers reported by compilers; keep the multi-byte
          handling.  Also use "%v" in the gcc compiler file and
          update the documentation (Hirohito Higashi).

fixes:  vim/vim#20321
closes: vim/vim#20359

https://github.com/vim/vim/commit/44dcad20f2781ce5c1bd9a851212377859cc5bea

Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
Co-authored-by: vimpostor <21310755+vimpostor@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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