[Build Script Helper] Use new SwiftPM flag to remove $ORIGIN from installed ELF executable runpaths

[finagolfin]

The latest trunk snapshot toolchain shows five executables built by SwiftPM that incorrectly have this runpath, three from this repo:

> readelf -d swift-DEVELOPMENT-SNAPSHOT-2023-10-10-a-ubuntu20.04/usr/bin/*|ag "File:|runpath"|ag "ORIGIN[^/]" -B1
File: swift-DEVELOPMENT-SNAPSHOT-2023-10-10-a-ubuntu20.04/usr/bin/docc
 0x000000000000001d (RUNPATH)            Library runpath: [$ORIGIN:$ORIGIN/../lib/swift/linux]
File: swift-DEVELOPMENT-SNAPSHOT-2023-10-10-a-ubuntu20.04/usr/bin/sourcekit-lsp
 0x000000000000001d (RUNPATH)            Library runpath: [$ORIGIN:$ORIGIN/../lib/swift/linux]
File: swift-DEVELOPMENT-SNAPSHOT-2023-10-10-a-ubuntu20.04/usr/bin/swift-build-sdk-interfaces
 0x000000000000001d (RUNPATH)            Library runpath: [$ORIGIN:$ORIGIN/../lib/swift/linux]
File: swift-DEVELOPMENT-SNAPSHOT-2023-10-10-a-ubuntu20.04/usr/bin/swift-driver
 0x000000000000001d (RUNPATH)            Library runpath: [$ORIGIN:$ORIGIN/../lib/swift/linux]
File: swift-DEVELOPMENT-SNAPSHOT-2023-10-10-a-ubuntu20.04/usr/bin/swift-help
 0x000000000000001d (RUNPATH)            Library runpath: [$ORIGIN:$ORIGIN/../lib/swift/linux]

This will remove that unneeded runpath, as I just did for swift-package in swiftlang/swift-package-manager#6947. I limited this to non-Darwin installs because I have no idea if this would be useful on Darwin too.

[finagolfin]

@artemcm, please take a look.

[artemcm]

This change makes sense to me.

[artemcm]

@swift-ci test

[finagolfin]

Ready for merge, I'll submit for 5.10 next.