Revert "[cmake] add Synchronization library to Supplemental build (swiftlang#81310)"

This reverts commit 50e3070.

Author: hamishknight

Runtimes/Resync.cmake

@@ -96,9 +96,6 @@ endforeach()
 message(STATUS "plist[${StdlibSources}/Info.plist.in] -> Core/Info.plist.in")
 copy_files("" "Core" FILES "Info.plist.in")
 
-message(STATUS "plist[${StdlibSources}/Info.plist.in] -> Supplemental/Synchronization/Info.plist.in")
-copy_files("" "Supplemental/Synchronization" FILES "Info.plist.in")
-
 # Platform Overlays
 
 # Copy magic linker symbols
@@ -156,8 +153,6 @@ copy_files(public/Platform Overlay/Windows/CRT
 # libraries, and test support libraries.
 
 # Supplemental Libraries
-copy_library_sources("Synchronization" "public" "Supplemental")
-
 
 # Copy StringProcessing, RegexParser, RegexBuilder
 if(NOT DEFINED StringProcessing_ROOT_DIR)

Runtimes/Supplemental/CMakeLists.txt

@@ -22,7 +22,6 @@ endif()
 
 set(COMMON_OPTIONS
   -DBUILD_SHARED_LIBS=${BUILD_SHARED_LIBS}
-  -DSwift_SDKROOT=${Swift_SDKROOT}
   -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
   -DCMAKE_INSTALL_LIBDIR=${CMAKE_INSTALL_LIBDIR}
   -DCMAKE_INSTALL_NAME_DIR=${CMAKE_INSTALL_NAME_DIR}
@@ -48,14 +47,3 @@ if(SwiftRuntime_ENABLE_stringprocessing)
     CMAKE_ARGS
       ${COMMON_OPTIONS})
 endif()
-
-# Synchronization
-if(SwiftRuntime_ENABLE_synchronization)
-  ExternalProject_Add(Synchronization
-    PREFIX "Synchronization"
-    SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/Synchronization"
-    INSTALL_DIR "${CMAKE_INSTALL_PREFIX}"
-    INSTALL_COMMAND ""
-    CMAKE_ARGS
-      ${COMMON_OPTIONS})
-endif()