RFR: mlrules: applying off-list suggestions [v2]

[Robin Westberg]

> Hi all,
> 
> In this PR I'll collect the various updates to the jdk mailing list rules file that I'm receiving off-list (which is
> perfectly fine, feel free to send plain suggestions my way and I'll collect them here!)
> Best regards,
> Robin

Robin Westberg has updated the pull request incrementally with five additional commits since the last revision:

 - Drop the -dev suffix
 - Non-build-related files in the root folder to jdk-dev
 - Updates for hotspot-compiler
 - Simplify gc-dev rules
 - Simplify build-dev rules

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

Changes:
  - all: https://git.openjdk.java.net/skara/pull/746/files
  - new: https://git.openjdk.java.net/skara/pull/746/files/3abc6bad..22117120

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=746&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=746&range=00-01

  Stats: 58 lines in 1 file changed: 4 ins; 19 del; 35 mod
  Patch: https://git.openjdk.java.net/skara/pull/746.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/746/head:pull/746

PR: https://git.openjdk.java.net/skara/pull/746