Add build steps to allow x64 jdk8 cross compilation on M1 mac

[Haroon-Khel]

Changes need to be made to allow x64 JDK8 to be built on our M1 machines.

adoptium/infrastructure#2536 (comment) includes steps taken to build x64 JDK8 in an ssh environment on our M1 mac machines. These steps need to be added to the build process

[Haroon-Khel]

Two of the main additions will be the use of Xcode11.7 during the build

xcode-select -switch path to /Applications/Xcode.11.7.app/

and using Rosetta to initiate the build via the arch -x86_64 command

arch -x86_64 ./makejdk-any-platform.sh --clean-git-repo --jdk-boot-dir 'path to x64 jdk8 mac binary'/Contents/Home --configure-args '--with-toolchain-type=clang --openjdk-target=x86_64-apple-darwin --with-cups=/opt/homebrew/opt/cups/' --target-file-name jdk8_x64.tar.gz --build-variant temurin jdk8u

[Haroon-Khel]

Out of interest I built a macos x64 jdk8 using xcode11.7 on macos12, I believe we currently use xcode10 on macos10 machines to build x64 jdk8.

It built successfully and am now running it through the aqa test pipeline job on a macos10.15 machine https://ci.adoptium.net/job/AQA_Test_Pipeline/180/console

[Haroon-Khel]

Weve got this to a stage where we are able to cross compile x64 mac binaries on our arm64 machines. #3509 remains a problem, but this issue can be closed