RFR: 4890732: GZIPOutputStream doesn't support optional GZIP fields [v11]

[Lin Zang]

> 4890732: GZIPOutputStream doesn't support optional GZIP fields

Lin Zang has updated the pull request incrementally with one additional commit since the last revision:

  delete trailing spaces

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3072/files
  - new: https://git.openjdk.java.net/jdk/pull/3072/files/474e54ce..35debf28

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3072&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3072&range=09-10

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3072.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3072/head:pull/3072

PR: https://git.openjdk.java.net/jdk/pull/3072