RFR: JDK-8260669: Missing quotes in fixpath.sh

[Erik Joelsson]

The build on Windows can fail if certain directory names are present in root directory of the workspace. In particular I've observed that the single letter 'p' is triggering this problem. This is caused by missing quotes around [:upper:] in a 'tr' call in fixpath.sh.

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Commit messages:
 - Fix quoting of tr args

Changes: https://git.openjdk.java.net/jdk/pull/2318/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2318&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260669
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2318.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2318/head:pull/2318

PR: https://git.openjdk.java.net/jdk/pull/2318