RFR: 8269967: JavaFX should fail fast on macOS below minimum version [v2]

[Kevin Rushforth]

> This PR implements a version check in the JavaFX runtime initialization code on macOS to ensure that the platform is running a version of macOS that is at or above the minimum version. If the platform is below the specified minimum, the JavaFX initialization code throws an exception.
> 
> The minimum version is passed from the `mac.gradle` file to the Mac glass code as a pair of build time constants, which are compared at runtime to the platform version.
> 
> Notes to reviewers:
> 
> * In case anyone is interested, the first commit has some debug logging which will print the minimum version and the detected platform version. I removed them with the second commit.

Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:

  Move version check to beginning of initIDs

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/567/files
  - new: https://git.openjdk.java.net/jfx/pull/567/files/6d4cdd61..4e24d454

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=567&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=567&range=00-01

  Stats: 56 lines in 1 file changed: 28 ins; 28 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/567.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/567/head:pull/567

PR: https://git.openjdk.java.net/jfx/pull/567