replaced implementation of OS checks in HostUtils with calls of PlatformUtil
------------- Commit messages: - replaced implementation of OS checks in HostUtils with calls of PlatformUtil Changes: https://git.openjdk.org/jfx/pull/1134/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1134&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8308028 Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod Patch: https://git.openjdk.org/jfx/pull/1134.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1134/head:pull/1134 PR: https://git.openjdk.org/jfx/pull/1134
