The upstream Zeta library uses spaces in filenames (e.g., "data model.h",
"character set.h"). The kernel's fixdep tool splits dependency paths on
spaces, causing it to try opening truncated paths like ".../inspection/data"
instead of ".../inspection/data model.h". This broke z80drv builds on the
VPS Jenkins server.
Vendoring the library with underscore-renamed files (as they exist on the
local dev machine) avoids this issue while keeping the same library content.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
