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ARM64 Link Page Alignment Adjustment, master branch (2021.01.21.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:ARMFixes-master-20210121 into master

Now setting page alignment separately for aarch64 from x86_64. Since as it turns out, aarch64 finds the alignment used for our x86_64 builds too small. Resulting in errors like:

ERROR: failed to load libAthenaServicesTest.so: libAthenaServicesTest.so: ELF load command alignment not page-aligned
make[3]: *** [aarch64-centos7-gcc9-opt/lib/libAthenaServicesTest.components] Error 1
make[3]: *** Deleting file `aarch64-centos7-gcc9-opt/lib/libAthenaServicesTest.components'
make[2]: *** [Control/AthenaServices/CMakeFiles/AthenaServicesTestComponentsList.dir/all] Error 2
make[2]: *** Waiting for unfinished jobs....

I really just chose the max-page-size value pretty randomly for the aarch64 platform. I saw this number mentioned online in a random Google search, and found that our build does succeed with it. But I didn't put any deeper thinking behind it...

This is of course needed for ATLINFR-3792.

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