RFR: JDK-8291558: unify print_jni_name_prefix_on and print_jni_name_suffix_on on posix platforms [v2]

[Matthias Baesken]

> print_jni_name_prefix_on and print_jni_name_suffix_on can be unified on the OpenJDK posix platforms.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Adjust comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9686/files
  - new: https://git.openjdk.org/jdk/pull/9686/files/e2f2670b..00a76bf4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9686&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9686&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9686.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9686/head:pull/9686

PR: https://git.openjdk.org/jdk/pull/9686