RFR: 8281400: Remove unused wcslen() function from globalDefinitions_gcc.hpp

[Harold Seigel]

Please review this small change to remove the unused wcslen() function.  This change was tested by running Mach5 tiers 1-2 on Linux, Mac OS, and Windows.

Thanks, Harold

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Commit messages:
 - 8281400: Remove unused wcslen() function from globalDefinitions_gcc.hpp

Changes: https://git.openjdk.java.net/jdk/pull/7374/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7374&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281400
  Stats: 6 lines in 1 file changed: 0 ins; 5 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7374.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7374/head:pull/7374

PR: https://git.openjdk.java.net/jdk/pull/7374