RFR: 8283575: Check for GNU time fails for version >1.7

[Erik Joelsson]

The version output of GNU time changed from "GNU time" to "GNU Time" in version 1.8. We need to update our check for identifying GNU time to handle this.

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Commit messages:
 - JDK-8283575

Changes: https://git.openjdk.java.net/jdk/pull/7925/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7925&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283575
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7925.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7925/head:pull/7925

PR: https://git.openjdk.java.net/jdk/pull/7925