[5.9] On ELF platforms, only add runpaths as needed (#6321) #6409
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Cherrypick of #6321
Explanation: The bootstrap script currently adds two relative runpaths for ELF platforms, one for the PackageDescription and other libraries and another for the single
swift-package
executable, but since they're applied on the command line, both runpaths are applied to all binaries. This pull separates out the runpaths and only applies each where needed. It also shifts much of the bootstrap script over to applying build flags based on the build target, not on checking the build host platform in Python.Scope: Should only affect the SPM build on ELF platforms like linux
Issue: None
Risk: low, as it only affects building SPM for ELF platforms
Testing: Passed all CI, including a trunk toolchain build that worked well
Reviewer: @neonichu