[jdk15u-dev] RFR: 8257547: Handle multiple prereqs on the same line in deps files

[Yuri Nesterenko]

The patch goes without adjustments. This fix is third in the series.

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Commit messages:
 - Backport 36209b70daf4df54435b6acd7092b77d2b5053df

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/36/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=36&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257547
  Stats: 85 lines in 3 files changed: 80 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/36.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/36/head:pull/36

PR: https://git.openjdk.java.net/jdk15u-dev/pull/36