RFR: 1892: Handle jfx cpu versions [v2]

[Erik Joelsson]

> The JdkVersion parser needs to handle versions on the form "jfx-cpu" and "jfxXXu-cpu". I chose to just accept any prefix string consisting of lower case letters.

Erik Joelsson has updated the pull request incrementally with one additional commit since the last revision:

  Fix pool record consumption for Xu-cpu versions

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Changes:
  - all: https://git.openjdk.org/skara/pull/1509/files
  - new: https://git.openjdk.org/skara/pull/1509/files/bc43df18..2316061f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1509&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1509&range=00-01

  Stats: 15 lines in 2 files changed: 13 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1509.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1509/head:pull/1509

PR: https://git.openjdk.org/skara/pull/1509