Update XCTest config for upstream changes on the CI

Author: finagolfin

swift-android-testing-trunk.patch

@@ -1,3 +1,18 @@
+diff --git a/swift-corelibs-xctest/cmake/modules/PlatformInfo.cmake b/swift-corelibs-xctest/cmake/modules/PlatformInfo.cmake
+index 468dc61..a90ae3d 100644
+--- a/swift-corelibs-xctest/cmake/modules/PlatformInfo.cmake
++++ b/swift-corelibs-xctest/cmake/modules/PlatformInfo.cmake
+@@ -2,6 +2,10 @@
+ set(print_target_info_invocation "${CMAKE_Swift_COMPILER}" -print-target-info)
+ if(CMAKE_Swift_COMPILER_TARGET)
+   list(APPEND print_target_info_invocation -target ${CMAKE_Swift_COMPILER_TARGET})
++else()
++  set(arg_list ${CMAKE_Swift_FLAGS})
++  separate_arguments(arg_list)
++  list(APPEND print_target_info_invocation ${arg_list})
+ endif()
+ execute_process(COMMAND ${print_target_info_invocation} OUTPUT_VARIABLE target_info_json)
+ message(CONFIGURE_LOG "Swift Target Info: ${print_target_info_invocation}\n"
 diff --git a/swift-testing/Sources/Testing/SourceAttribution/Backtrace.swift b/swift-testing/Sources/Testing/SourceAttribution/Backtrace.swift
 index 78227e3..e0db2e9 100644
 --- a/swift-testing/Sources/Testing/SourceAttribution/Backtrace.swift