RFR: 8256686: GitHub actions: build fails due to upgraded MSVC compiler

[Kevin Rushforth]

Simple fix to get GitHub actions working again on Windows. In parallel I will bump the priority of [JDK-8255713](https://bugs.openjdk.java.net/browse/JDK-8255713) so we will detect the version of the compiler and not be sensitive to changes like this on the target machine.

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Commit messages:
 - 8256686: GitHub actions: build fails due to upgraded MSVC compiler

Changes: https://git.openjdk.java.net/jfx/pull/357/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=357&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256686
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/357.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/357/head:pull/357

PR: https://git.openjdk.java.net/jfx/pull/357