RFR: 8378034: Add licenses for gcc 14.2.0 [v2]

[Kevin Rushforth]

> Added license file for gcc 14.2.0. After integration in mainline, I intend to backport it to the `jfx26` stabilization branch.
> 
> This is the JavaFX equivalent of PR openjdk/jdk#29661 / [JDK-8377509](https://bugs.openjdk.org/browse/JDK-8377509).

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

  Only deliver gcc.md on Linux

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/2076/files
  - new: https://git.openjdk.org/jfx/pull/2076/files/955f1ecc..87142236

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=2076&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=2076&range=00-01

  Stats: 12 lines in 1 file changed: 12 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/2076.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2076/head:pull/2076

PR: https://git.openjdk.org/jfx/pull/2076