WinSDK: make ClangModules public

When building against the build tree, we need to ensure that the flags
for the ClangModule propagate. This is required to ensure that we get
the modules visible even when building the rest of the SDK.

Author: compnerd

Runtimes/Overlay/Windows/WinSDK/CMakeLists.txt

@@ -7,8 +7,9 @@ target_compile_definitions(swiftWinSDK PRIVATE
   $<$<BOOL:${SwiftOverlay_ENABLE_REFLECTION}>:SWIFT_ENABLE_REFLECTION>)
 target_compile_options(swiftWinSDK PRIVATE
   "SHELL:-Xfrontend -disable-force-load-symbols")
+target_link_libraries(swiftWinSDK PUBLIC
+  ClangModules)
 target_link_libraries(swiftWinSDK PRIVATE
-  ClangModules
   swiftCore)
 
 # FIXME: Why is this not implicitly in the interface flags?