A16-2-2: Library includes are not useless on real compilers

Our useless include query is looking for includes where nothing from the
included file is used by the including file. In this case, the declaration of
v transitively uses std::size_t, and `#include <algorithm>` transitively
includes the file that defines std::size_t. To detect such cases we would need
to report redundant includes e.g. includes for which useful symbols are
provided, but which are made unnecessary by other imports in the file.

For now we just exclude these expected results, as modifying the query is
tricky. Furthermore, the intention of the rule is actually that we check
standard library includes against the list of symbols as per the standard
library, but again this is challenging.

Author: lcartey

cpp/autosar/test/rules/A16-2-2/UnusedIncludeDirectives.expected.clang

@@ -0,0 +1 @@
+| test.cpp:1:1:1:19 | #include "test.hpp" | Nothing in this file uses anything from "test.hpp" |

cpp/autosar/test/rules/A16-2-2/UnusedIncludeDirectives.expected.gcc

@@ -0,0 +1 @@
+| test.cpp:1:1:1:19 | #include "test.hpp" | Nothing in this file uses anything from "test.hpp" |

cpp/autosar/test/rules/A16-2-2/UnusedIncludeDirectives.expected.qcc

@@ -0,0 +1 @@
+| test.cpp:1:1:1:19 | #include "test.hpp" | Nothing in this file uses anything from "test.hpp" |

cpp/autosar/test/rules/A16-2-2/test.cpp

@@ -1,5 +1,5 @@
-#include "test.hpp"  //NON_COMPLIANT
-#include <algorithm> //NON_COMPLIANT
+#include "test.hpp" //NON_COMPLIANT
+#include <algorithm> //NON_COMPLIANT - redundant but not useless on real compilers
 #include <vector>    //COMPLIANT
 
 std::vector<int> v;