RFR: 8333795: [mobile] allow building jdk native libs for ios/android

[Johan Vos]

This PR contains the changes that are needed to build the native JDK class libraries for ios/android.
After a successful configuration, invoking
`make static-libs`
should produces static libs for the JDK classes.

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

Commit messages:
 - Fix whitespace
 - Allow building static JDK libs for ios/android

Changes: https://git.openjdk.org/mobile/pull/26/files
  Webrev: https://webrevs.openjdk.org/?repo=mobile&pr=26&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333795
  Stats: 137 lines in 32 files changed: 115 ins; 0 del; 22 mod
  Patch: https://git.openjdk.org/mobile/pull/26.diff
  Fetch: git fetch https://git.openjdk.org/mobile.git pull/26/head:pull/26

PR: https://git.openjdk.org/mobile/pull/26