build

osc.lua: use private options to control SUB/OSD offset #15888

Job	Run time
linux (clang, clang++, lld, -Db_lto=true -Db_lto_mode=thin)	1h 14m 56s
mingw (i686, wine32)	5m 37s
freebsd	4m 17s
win32 (aarch64-pc-windows-msvc, arm64, windows-11-arm)	16m 17s
macos (macos-26, test, -target arm64-apple-macosx10.15, 10.15)	4m 29s
linux-fuzz	1h 32m 15s
mingw (x86_64, wine64)	7m 53s
linux-ffmpeg-6-1	58s
linux (gcc, g++, -Db_ndebug=true)	1h 14m 53s
msys2 (clang64, windows-2025-vs2026, true)	6m 30s
macos (macos-26, arm)	5m 2s
macos (macos-15-intel)	6h 5m 0s
msys2 (clang64, windows-2025-vs2026, zero)	5m 42s
openbsd	5m 43s
win32 (x86_64-pc-windows-msvc, x64, windows-2025-vs2026)	21m 55s
msys2 (clang64, windows-2025-vs2026, uninitialized)	5m 34s
msys2 (ucrt64, windows-2025-vs2026)	6m 18s
macos (macos-14, arm, Xcode_15.0)	8m 1s
msys2 (clang64, windows-2025-vs2026, pattern)	5m 8s
macos (macos-15, arm)	5m 12s
msys2 (mingw64, windows-2025-vs2026)	6m 34s
msys2 (clangarm64, windows-11-arm)	7m 42s
	12h 15m 56s

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