Update documentation (README.md)
Replace alt-java patch with a binary separate from the JDK
Drop stale patches that are of little use any more:
- * nss.cfg has been disabled since early PKCS11 work and long superseded by FIPS work
- * No accessibility subpackage to warrant RH1648242 & RH1648644 patches any more
- * No use of system libjpeg turbo to warrant RH649512 patch any more
- Replace RH1684077 pcsc-lite-libs patch with better JDK-8009550 fix being upstreamed
Adapt alt-java test to new binary where there is always a set_speculation function
Related: RHEL-12998
