Open XL workaround: lower optimization level for codertinit.cpp

[Deigue]

Open XL compilation causes "expected relocatable expression" error when attempting to compile codertinit.cpp with the O3 optimization level. It was recommended to lower the optimization level for this particular file and an issue has been opened internally to track fixing this issue in context of Open XL.

[Deigue]

Rebased, passing with java 21 and java 8, ready to review/merge @keithc-ca

[Deigue]

Thanks for the feedback, I have addressed the comments/missing changes.

[keithc-ca]

Jenkins compile aix jdk21