RFR: 8305955: Remove Visual C++ specific workaround in javac

[Julian Waters]

Visual C++ no longer requires the use of the i64 literal syntax and instead recommends the use of LL instead, so we should remove this workaround in the JNIWriter (this also helps when users write Windows JNI code meant to be compiled with alternate compilers other than Visual C++)

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Commit messages:
 - Remove Visual C++ specific workaround in javac

Changes: https://git.openjdk.org/jdk/pull/13457/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13457&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305955
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13457.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13457/head:pull/13457

PR: https://git.openjdk.org/jdk/pull/13457