Build Synchronization on Windows installer

Author: Azoy

utils/build.ps1

@@ -950,6 +950,7 @@ function Build-Compilers() {
         SWIFT_ENABLE_EXPERIMENTAL_DISTRIBUTED = "YES";
         SWIFT_ENABLE_EXPERIMENTAL_OBSERVATION = "YES";
         SWIFT_ENABLE_EXPERIMENTAL_STRING_PROCESSING = "YES";
+        SWIFT_ENABLE_SYNCHRONIZATION = "YES";
         SWIFT_PATH_TO_LIBDISPATCH_SOURCE = "$SourceCache\swift-corelibs-libdispatch";
         SWIFT_PATH_TO_SWIFT_SYNTAX_SOURCE = "$SourceCache\swift-syntax";
         SWIFT_PATH_TO_STRING_PROCESSING_SOURCE = "$SourceCache\swift-experimental-string-processing";
@@ -1156,6 +1157,7 @@ function Build-Runtime($Arch) {
         SWIFT_ENABLE_EXPERIMENTAL_DISTRIBUTED = "YES";
         SWIFT_ENABLE_EXPERIMENTAL_OBSERVATION = "YES";
         SWIFT_ENABLE_EXPERIMENTAL_STRING_PROCESSING = "YES";
+        SWIFT_ENABLE_SYNCHRONIZATION = "YES";
         SWIFT_NATIVE_SWIFT_TOOLS_PATH = "$BinaryCache\1\bin";
         SWIFT_PATH_TO_LIBDISPATCH_SOURCE = "$SourceCache\swift-corelibs-libdispatch";
         SWIFT_PATH_TO_STRING_PROCESSING_SOURCE = "$SourceCache\swift-experimental-string-processing";