build: repair the windows cross-compilation

The SIMDOperators module was being added prior to SwiftOnoneSupport, which
resulted in the import library target for Windows not being setup prior to use.
As a result, we would link against the DLL rather than the import library which
is not supported (except as a MinGW hack in the binutils linker).  Re-order the
registration to ensure that the target is setup already.

Author: compnerd

stdlib/public/CMakeLists.txt

@@ -55,8 +55,12 @@ if(SWIFT_BUILD_STDLIB)
   add_subdirectory(runtime)
   add_subdirectory(stubs)
   add_subdirectory(core)
-  add_subdirectory(SIMDOperators)
   add_subdirectory(SwiftOnoneSupport)
+
+  # NOTE(compnerd) this must come after the SwiftOnoneSupport as the current
+  # cross-compilation support has to hand roll the import library setup which
+  # requires that the target is setup prior to use.
+  add_subdirectory(SIMDOperators)
 endif()
 
 if(SWIFT_BUILD_STDLIB OR SWIFT_BUILD_REMOTE_MIRROR)