RFR: 8256978: GitHub actions: build fails on Linux due to missing package

[Kevin Rushforth]

This is a simple fix to remove and unused package from the list of packages we specify to install on Linux when running GitHub actions.

As a follow-on fix, I am going to do what the JDK did and specify the version of each OS to use to partially insulate us from such changes in the GitHub actions defaults.

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Commit messages:
 - 8256978: GitHub actions: build fails on Linux due to missing package

Changes: https://git.openjdk.java.net/jfx/pull/359/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=359&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256978
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/359.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/359/head:pull/359

PR: https://git.openjdk.java.net/jfx/pull/359