Explanation: Updates the build script to add a new header include path when building tests
Scope: Affects building tests for XCTest itself, should not have any effect at this time
Original PR: https://github.com/apple/swift-corelibs-xctest/pull/493
Risk: Minimal - this simply adds a new include path to the XCTest tests build which does not yet exist
Testing: Testing done via local execution of tests and swift-ci testing
Reviewer: @stmontgomery @briancroom @parkera
Cherry pick of https://github.com/apple/swift-corelibs-xctest/pull/493
Explanation: Updates the build script to add a new header include path when building tests Scope: Affects building tests for XCTest itself, should not have any effect at this time Original PR: https://github.com/apple/swift-corelibs-xctest/pull/493 Risk: Minimal - this simply adds a new include path to the XCTest tests build which does not yet exist Testing: Testing done via local execution of tests and swift-ci testing Reviewer: @stmontgomery @briancroom @parkera