Found by uselex.rb:
    complain: [R]: exported from: ./utils/unlit/dist/build/unlit.o
    egetc: [R]: exported from: ./utils/unlit/dist/build/unlit.o
    myputc: [R]: exported from: ./utils/unlit/dist/build/unlit.o
    readline: [R]: exported from: ./utils/unlit/dist/build/unlit.o
    unlit: [R]: exported from: ./utils/unlit/dist/build/unlit.o
    writeerror: [R]: exported from: ./utils/unlit/dist/build/unlit.o

Signed-off-by: Sergei Trofimovich <siarheit@google.com>