RFR: 8280059: Incorrect glibc version is used in a comment in os_linux.cpp

[David Holmes]

Please review this trivial correction:

s/2.7/2.27/

Thanks,
David

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Commit messages:
 - 8280059: Incorrect glibc version is used in a comment in os_linux.cpp

Changes: https://git.openjdk.java.net/jdk/pull/7103/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7103&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280059
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7103.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7103/head:pull/7103

PR: https://git.openjdk.java.net/jdk/pull/7103