MediaPipe 1.1.0 links its SQLite memory and vector stores from prebuilt
archives built with Google's internal toolchain. They have no archive symbol
table, and once indexed they still need Google's libc++ (std::__u) and
internal symbols (__alloc_token_*__Znwm, sqlite_helpers, sqlite3_vector_init),
so the link of libmediapipe.so fails. Drop the semantic retriever's C API from
the library; mediapipe and its other tasks import and work as before.