Revert "[cxx-interop] Do not install binary .swiftmodule files for the overlays"

This reverts commit 16b2808.

Author: hamishknight

stdlib/cmake/modules/SwiftSource.cmake

@@ -749,9 +749,7 @@ function(_compile_swift_files
     endif()
 
     set(exclude_binary_swiftmodule_installation_args "")
-    if(NOT SWIFTFILE_INSTALL_BINARY_SWIFTMODULE OR
-       (SWIFTFILE_INSTALL_BINARY_SWIFTMODULE STREQUAL "NON_DARWIN_ONLY" AND
-        SWIFTFILE_SDK IN_LIST SWIFT_DARWIN_PLATFORMS))
+    if(NOT SWIFTFILE_INSTALL_BINARY_SWIFTMODULE)
         list(APPEND
           exclude_binary_swiftmodule_installation_args
           "REGEX" "${SWIFTFILE_MODULE_NAME}.swiftmodule/[^/]*\\.swiftmodule$" EXCLUDE)

stdlib/public/Cxx/CMakeLists.txt

@@ -39,7 +39,6 @@ add_swift_target_library(swiftCxx STATIC NO_LINK_NAME IS_STDLIB IS_SWIFT_ONLY
     DEPENDS ${SWIFT_CXX_DEPS}
     MACCATALYST_BUILD_FLAVOR zippered
     INSTALL_IN_COMPONENT compiler
-    INSTALL_BINARY_SWIFTMODULE NON_DARWIN_ONLY
     INSTALL_WITH_SHARED)
 
 add_subdirectory(libstdcxx)

stdlib/public/Cxx/std/CMakeLists.txt

@@ -81,6 +81,5 @@ add_swift_target_library(swiftCxxStdlib STATIC NO_LINK_NAME IS_STDLIB IS_SWIFT_O
     TARGET_SDKS ALL_APPLE_PLATFORMS LINUX WINDOWS ANDROID
     MACCATALYST_BUILD_FLAVOR zippered
     INSTALL_IN_COMPONENT compiler
-    INSTALL_BINARY_SWIFTMODULE NON_DARWIN_ONLY
     INSTALL_WITH_SHARED
     DEPENDS libstdcxx-modulemap libcxxshim_modulemap CxxStdlib-apinotes)