Keep the original C translation units as declaration-only build shims while
the Rust CLI helper archive owns datagen and lorem. Track both Rust sources in
the program and test archive prerequisites, and link the helpers-only archive
into C test binaries that still provide their own file I/O and orchestration.
This preserves the existing C test harnesses while making the migrated helper
implementations the single definitions used by the binary and tests.
Test Plan:
- make -C programs zstd V=1
- make -C tests datagen V=1
- make -C tests test-rust-lib-smoke V=1
- git diff --check
Refs: programs/datagen.c, programs/lorem.c, tests/Makefile
ddidderr
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