[jdk11u-dev] RFR: 8258005: JDK build fails with incorrect fixpath script

[Dan Lutker]

Fixing issue caused by backport of [JDK-8257679](https://bugs.openjdk.org/browse/JDK-8257679)

If the path contains multiple parts then only the 1st `` is escaped which causes a build break.

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Commit messages:
 - Backport 0890620c94cd9d0aca6289e85b3980b64cd122ed

Changes: https://git.openjdk.org/jdk11u-dev/pull/1568/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1568&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8258005
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1568.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1568/head:pull/1568

PR: https://git.openjdk.org/jdk11u-dev/pull/1568