RFR: 8303169: Remove Windows specific workaround from libdt

[Julian Waters]

We no longer need to define PrId64 ourselves since the Visual C++ compiler supports inttypes.h on the only versions we support, so we can just replace it with an include to the standard header instead

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Commit messages:
 - Remove Windows specific workaround from libdt

Changes: https://git.openjdk.org/jdk/pull/12744/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12744&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303169
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12744.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12744/head:pull/12744

PR: https://git.openjdk.org/jdk/pull/12744