Improvements to flutter doctor JDK search. (#8745)

- [x] Add custom logic on MacOS to determine if Java is installed before invoking `java`.
- [x] Check JAVA_HOME, platform specific logic, and finally PATH to locate the `java` executable.
- [x] Improved doctor messages.

Fixes #8508
Fixes #8521
1 file changed
tree: f9b573dc592787a335544c702fa8861cb782d27c
  1. .idea/
  2. bin/
  3. dev/
  4. examples/
  5. packages/
  6. .analysis_options
  7. .analysis_options_repo
  8. .gitattributes
  9. .gitignore
  10. .travis.yml
  11. appveyor.yml
  12. AUTHORS
  13. CONTRIBUTING.md
  14. ISSUE_TEMPLATE.md
  15. LICENSE
  16. PATENTS
  17. README.md
  18. VERSION
README.md

Flutter

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