RFR: 8340467: [mobile] duplicate symbols in libprefs.a on iOS [v2]

[Johan Vos]

> Using both the unix native code and the mac native code results in 2 JNI_OnLoad functions in the native prefs library.
> Don't use unix code when creating native lib for java.prefs on ios. We should only use the macos code.

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  Add comment

-------------

Changes:
  - all: https://git.openjdk.org/mobile/pull/29/files
  - new: https://git.openjdk.org/mobile/pull/29/files/8e8676a0..8eb9c9ab

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=mobile&pr=29&range=01
 - incr: https://webrevs.openjdk.org/?repo=mobile&pr=29&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/mobile/pull/29.diff
  Fetch: git fetch https://git.openjdk.org/mobile.git pull/29/head:pull/29

PR: https://git.openjdk.org/mobile/pull/29