Merge pull request swiftlang#38859 from gottesmm/pr-dad49452cfb7f592ae5d681a1419fa0137a4eb56

[swift-stage2] Install CMakeConfig.h as a testsuite-tool into the just built toolchain.

Author: gottesmm

include/swift/Runtime/CMakeLists.txt

@@ -11,3 +11,6 @@ endif()
 
 configure_file(CMakeConfig.h.in ${CMAKE_CURRENT_BINARY_DIR}/CMakeConfig.h
                ESCAPE_QUOTES @ONLY)
+swift_install_in_component(FILES ${CMAKE_CURRENT_BINARY_DIR}/CMakeConfig.h
+                           DESTINATION "include/swift/Runtime"
+                           COMPONENT testsuite-tools)