Allow custom dispatch include path in SwiftPM package build #5025
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This adds a
DISPATCH_INCLUDE_PATH
environment variable that allows specifying the location at which the package build can find dispatch headers. On linux/android this path still defaults to/usr/lib/swift
. This will allow us to build the tests of this package via SwiftPM in the toolchain build where we build against a just-built toolchain (and/usr/lib/swift
doesn't exist).