Make file formatting comply with POSIX standards (#3242)

Add newlines to two files

examples/cpp-interface/CMakeLists.txt

@@ -16,4 +16,4 @@ add_spvtools_example(
   TARGET spirv-tools-cpp-example
   SRCS main.cpp
   LIBS SPIRV-Tools-opt
-)
+)

utils/vscode/extension.js

@@ -63,4 +63,4 @@ exports.activate = activate;
 // this method is called when your extension is deactivated
 function deactivate() {
 }
-exports.deactivate = deactivate;
+exports.deactivate = deactivate;