[5.9][Driver] Remove unused runtime library path on non-Darwin platforms #66745
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Cherrypick of #66546
Explanation: As detailed in the linked issue, the compiler currently looks in
/sdk/usr/lib/swift/
if an-sdk
is explicitly specified, which may be needed for Darwin platforms, but is unused on non-Darwin. This is a translation of swiftlang/swift-driver#1381 to the legacy C++ Driver, with the addition of a test.Scope: Only affects an unused library path on non-Darwin platforns
Issue: #63416
Risk: low, as nobody appears to use it
Testing: Passed all CI on trunk
Reviewer: @artemcm