Block plain_table_index.cc in ROCKSDB_LITE

Summary: Block plain_table_index.cc in ROCKSDB_LITE

Test Plan:
make clean
make OPT=-DROCKSDB_LITE shared_lib -j32
make clean
make shared_lib -j32

Reviewers: ljin, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D29535