build: match hardcoded extensions in the compiler

The swiftdoc partials must have the extension .swiftdoc.  Adjust the
output names to match this assumption.  This is needed to repair the
CMake build with the newer compiler.

Author: compnerd

cmake/modules/SwiftSupport.cmake

@@ -66,8 +66,8 @@ function(add_swift_target target)
     get_filename_component(name ${source} NAME)
 
     set(obj ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}${CMAKE_C_OUTPUT_EXTENSION})
-    set(mod ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}.swiftmodule~partial)
-    set(doc ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}.swiftdoc~partial)
+    set(mod ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}.swiftmodule)
+    set(doc ${CMAKE_CURRENT_BINARY_DIR}/${target}.dir/${name}.swiftdoc)
 
     set(all_sources ${sources})
     list(INSERT all_sources ${i} -primary-file)