`OjtPhoneme::{start,end}`を消す #1007

Job	Run time
rust-integration-test-strategy-matrix	1s
rust-lint	4m 1s
rust-unit-test	4m 12s
actionlint	16s
shellcheck	19s
validate-cargo-lock	20s
build-and-test-java-api (windows-latest)	5m 31s
build-and-test-python-api (windows-latest)	6m 14s
build-and-test-java-api (macos-latest)	3m 4s
build-and-test-python-api (macos-latest)	3m 18s
build-and-test-java-api (ubuntu-latest)	2m 50s
build-and-test-python-api (ubuntu-latest)	2m 59s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 40s
build-windows-cpp-example	3m 28s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 36s
c-header	46s
rust-integration-test (macos-12)	3m 35s
rust-integration-test (ubuntu-20.04)	1m 31s
	45m 41s

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