[code-reflection] Integrated: Now longer allow cmake builds from hat root dir

[Gary Frost]

Removed hat root cmake artifacts.

Build with maven (via bash build.bash)

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Commit messages:
 - Now longer allow cmake builds from hat root dir

Changes: https://git.openjdk.org/babylon/pull/199/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=199&range=00
  Stats: 767 lines in 3 files changed: 0 ins; 767 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/199.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/199/head:pull/199

PR: https://git.openjdk.org/babylon/pull/199