Add build support for PIE code generation for executables#1871

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KevinJW wants to merge 6 commits intoAcademySoftwareFoundation:mainfrom

KevinJW:1857-ocioarchivedirmaincppo-relocation-r_x86_64_32-against-bss-can-not-be-used-when-making-a-pie-object

Commits on Sep 22, 2023

Bump CMake minimum version to 3.15, allow support for PIE linker flags
KevinJW
committed
Support CMake option for building all executables as position independent
KevinJW
committed
Add documentation note to build instructions for PIE generation
KevinJW
committed

Commits on Sep 25, 2023