RFR: JDK-8274977: Remove expandPacked and extendEdge from awt_ImagingLib.c

[Matthias Baesken]

Please review this small cleanup change.
Looks like expandPacked and extendEdge from awt_ImagingLib.c are unreferenced/unused and can be removed.

Thanks, Matthias

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

Commit messages:
 - JDK-8274977

Changes: https://git.openjdk.java.net/jdk/pull/5866/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5866&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274977
  Stats: 85 lines in 1 file changed: 0 ins; 84 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5866.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5866/head:pull/5866

PR: https://git.openjdk.java.net/jdk/pull/5866