Update release notes for shenandoah-8u372-b07.
Require tzdata 2023c due to inclusion of JDK-8305113 in 8u372-b07
Update generate_tarball.sh to add support for passing a boot JDK to the configure run
Add POSIX-friendly error codes to generate_tarball.sh and fix whitespace
Remove .jcheck and GitHub support when generating tarballs, as done in upstream release tarballs
Drop JDK-8275535/RH2053256 patch which is now upstream
Include JDK-8271199 backport early ahead of 8u382 (RH2175317)
Drop hack for difference in local and portable build version
Replace local copies of JDK portable binaries with build dependencies
Include the java-1.8.0-openjdk-portable.spec file with instructions on how to rebuild.
Remove duplicate use of README.md inside the *-src package (it is no longer about sources)
Use portable build on x86_32 now one is available
** This tarball is embargoed until 2023-04-18 @ 1pm PT. **
Resolves: rhbz#2185182
Resolves: rhbz#2189329
Resolves: rhbz#2188023
