RFR: JDK-8270820: remove unused stiFileTableIndex from SDE.c

[Matthias Baesken]

Hello, please review this very small change. While checking compiler warnings of the type : "function 'xyz' was declared but never referenced" I came across stiFileTableIndex from SDE.c that generated such a warning and can be removed.

Thanks, Matthias

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Commit messages:
 - JDK-8270820

Changes: https://git.openjdk.java.net/jdk/pull/4805/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4805&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270820
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4805.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4805/head:pull/4805

PR: https://git.openjdk.java.net/jdk/pull/4805