RFR: 8323671: DevKit build gcc libraries contain full paths to source location [v2]

[Andrew Leonard]

> This PR adds --with-debug-prefix-map to the building of gcc in the DevKit make file to map the top OUTPUT_ROOT folder to a standard "devkit" path, thus ensuring DevKit builds are reproducible regardless of the folder the DevKit is built within.

Andrew Leonard has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' of github.com:openjdk/jdk into devkit_map
 - 8323671: DevKit build gcc libraries contain full paths to source location
   
   Signed-off-by: Andrew Leonard <anleonar at redhat.com>
 - 8323671: DevKit build gcc libraries contain full paths to source location
   
   Signed-off-by: Andrew Leonard <anleonar at redhat.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17400/files
  - new: https://git.openjdk.org/jdk/pull/17400/files/35944221..c4014643

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17400&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17400&range=00-01

  Stats: 2523 lines in 71 files changed: 2012 ins; 198 del; 313 mod
  Patch: https://git.openjdk.org/jdk/pull/17400.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17400/head:pull/17400

PR: https://git.openjdk.org/jdk/pull/17400