Fixes for Windows issues found in the course of https://github.com/bazel-contrib/rules_jvm_external/pull/1297: 1) Use platform-specific path separators. 2) Add Kotlin standard library jars to the data of tools so that the Windows Java launcher can find them in the runfiles manifest.

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RBE :ubuntu: Ubuntu 16.04 LTS (OpenJDK 8, gcc 5.4.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.6 bazelci.py runner --task=rbe_ubuntu1604
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Unit Tests on :ubuntu: Ubuntu 18.04 LTS (OpenJDK 11, gcc 7.5.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.6 bazelci.py runner --task=unittests_config_01
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Unit Tests on :ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.8 bazelci.py runner --task=unittests_config_02
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Unit Tests on :ubuntu: Ubuntu 18.04 LTS (OpenJDK 11, gcc 7.5.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.6 bazelci.py runner --task=unittests_config_03
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Unit Tests on :ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.8 bazelci.py runner --task=unittests_config_04
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Integration Tests on :ubuntu: Ubuntu 18.04 LTS (OpenJDK 11, gcc 7.5.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.6 bazelci.py runner --task=integration_tests_config_01
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Integration Tests on :ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1739485790 -o bazelci.py && python3.8 bazelci.py runner --task=integration_tests_config_02
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Total Job Run Time: 9m 19s