Moderate: java-21-openjdk security update (Oracle Linux 8)

[1:21.0.5.0.10-3.0.1]
- Add Oracle vendor bug URL [Orabug: 34340155]

[1:21.0.5.0.10-3]
- Sync the copy of the portable specfile with the latest update
- ** This tarball is embargoed until 2024-10-15 @ 1pm PT. **
- Related: RHEL-61346

[1:21.0.5.0.10-2]
- Update to jdk-21.0.5+10 (GA)
- Update release notes to 21.0.5+10
- Bump giflib version to 5.2.2 following JDK-8328999
- Bump libpng version to 1.6.43 following JDK-8329004
- Vary portablesuffix depending on whether we are on RHEL ('el8') or CentOS ('el9')
- Handle debugedit being a separate package installed in /usr on RHEL/CentOS 10
- Add build scripts to repository to ease remembering all CentOS & RHEL targets and options
- Sync with RHEL 7 portable build:
- Use ExclusiveArch over ExcludeArch
- pkgos definition needs to be early enough to be used in portablesuffix
- Make build scripts executable
- Sync the copy of the portable specfile with the latest update
- Revert JDK-8327501 & JDK-8328366 backport until more mature.
- Resolves: RHEL-58798
- Resolves: RHEL-17186
- Resolves: RHEL-61346
- ** This tarball is embargoed until 2024-10-15 @ 1pm PT. **