Update to minimum CMake 3.5

And modernise some examples.

04-static-analysis/cppcheck-compile-commands/subproject2/CMakeLists.txt

@@ -1,10 +1,5 @@
 # Set the project name
 project (subproject2)
 
-# Create a sources variable with a link to all cpp files to compile
-set(SOURCES
-    main2.cpp
-)
-
 # Add an executable with the above sources
-add_executable(${PROJECT_NAME} ${SOURCES})
+add_executable(${PROJECT_NAME} main2.cpp)