Revert "[6.0] Fix build error"

This reverts commit 84f8089.

Author: kateinoigakukun

schemes/release-6.0/build/build-target-toolchain.sh

@@ -120,7 +120,7 @@ build_target_toolchain() {
     -D SWIFT_RUNTIME_CRASH_REPORTER_CLIENT=NO \
     -D SWIFT_STDLIB_INSTALL_PARENT_MODULE_FOR_SHIMS=NO \
     -D SWIFT_BUILD_DYNAMIC_SDK_OVERLAY=NO \
-    -D SWIFT_BUILD_STATIC_SDK_OVERLAY=YES \
+    -D SWIFT_BUILD_STATIC_SDK_OVERLAY=NO \
     -D SWIFT_PATH_TO_SWIFT_SYNTAX_SOURCE="$SOURCE_PATH/swift-syntax" \
     -D SWIFT_PATH_TO_STRING_PROCESSING_SOURCE="$SOURCE_PATH/swift-experimental-string-processing" \
     -G Ninja \