RFR: 8232158: [macOS] Fallback to command line tools if xcode is missing

[Arunprasad Rajkumar]

8232158: [macOS] Fallback to command line tools if xcode is missing

----------------

Commits:
 - 063d2f38: JDK-8232158: [macOS] Fallback to command line tools if xcode is missing

Changes: https://git.openjdk.java.net/jfx/pull/13/files
 Webrev: https://webrevs.openjdk.java.net/jfx/13/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8232158
  Stats: 33 lines in 1 file changed: 15 ins; 1 del; 17 mod
  Patch: https://git.openjdk.java.net/jfx/pull/13.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/13/head:pull/13

PR: https://git.openjdk.java.net/jfx/pull/13