[jdk11u-dev] RFR: 8214459: NSS source should be removed

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 3525e4e27f89cdde493425585e3d602a27149295

Changes: https://git.openjdk.org/jdk11u-dev/pull/1842/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1842&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8214459
  Stats: 1 line in 2 files changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1842.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1842/head:pull/1842

PR: https://git.openjdk.org/jdk11u-dev/pull/1842