[jdk16] RFR: JDK-8259645: Revert "8245956: JavaCompiler still uses File API instead of Path API in a specific case"

[Jonathan Gibbons]

This reverts commit 46c9a860b6516c119f11edee2deb3d9f62907323.

The fix for 8245956 exposed a bug in the underlying URL API, regarding the encoding of non-ASCII characters in filenames.
The fix is reverted until the underlying problem can be addressed.

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Commit messages:
 - Revert "8245956: JavaCompiler still uses File API instead of Path API in a specific case"

Changes: https://git.openjdk.java.net/jdk16/pull/112/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=112&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259645
  Stats: 71 lines in 2 files changed: 0 ins; 67 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/112.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/112/head:pull/112

PR: https://git.openjdk.java.net/jdk16/pull/112