Ocaml test-suite 'passes' with c++11 testing now

Test c++17 on Github Actions to try keep it passing when
configure detects g++ can test c++17.

.github/workflows/ci.yml

@@ -296,6 +296,7 @@ jobs:
         - SWIGLANG: mzscheme
           continue-on-error: true
         - SWIGLANG: ocaml
+          CPPSTD: c++17
           continue-on-error: true
           os: ubuntu-18.04 # ocaml-4.08 in ubuntu-20.04 not yet working
       # Run all of them, as opposed to aborting when one fails

Examples/test-suite/cpp11_rvalue_reference2.i

@@ -20,10 +20,10 @@ static const bool PublicGlobalTrue = true;
 static const UserDef PublicUserDef = UserDef();
 struct Thingy {
   typedef int Integer;
-  int val;
+  int valval;
   int &lvalref;
   int &&rvalref;
-  Thingy(int v, int &&rvalv) : val(v), lvalref(val), rvalref(std::move(rvalv)) {}
+  Thingy(int v, int &&rvalv) : valval(v), lvalref(valval), rvalref(std::move(rvalv)) {}
   void refIn(long &i) {}
   void rvalueIn(long &&i) {}
   short && rvalueInOut(short &&i) { return std::move(i); }
@@ -31,10 +31,10 @@ struct Thingy {
   // test both primitive and user defined rvalue reference default arguments and compactdefaultargs
   void compactDefaultArgs(const bool &&b = (const bool &&)PublicGlobalTrue, const UserDef &&u  = (const UserDef &&)PublicUserDef) {}
   void privateDefaultArgs(const bool &&b = (const bool &&)PrivateTrue) {}
-  operator int &&() { return std::move(val); }
-  Thingy(const Thingy& rhs) : val(rhs.val), lvalref(rhs.lvalref), rvalref(std::move(rhs.rvalref)) {}
+  operator int &&() { return std::move(valval); }
+  Thingy(const Thingy& rhs) : valval(rhs.valval), lvalref(rhs.lvalref), rvalref(std::move(rhs.rvalref)) {}
   Thingy& operator=(const Thingy& rhs) {
-    val = rhs.val;
+    valval = rhs.valval;
     lvalref = rhs.lvalref;
     rvalref = rhs.rvalref;
     return *this;

Examples/test-suite/cpp11_template_explicit.i

@@ -12,7 +12,7 @@
 
 template<typename T> class Temper {
 public:
-  T val;
+  T valu;
 };
 
 class A {

Examples/test-suite/cpp11_userdefined_literals.i

@@ -17,8 +17,8 @@
 #include <iostream>
 
 struct OutputType {
-  int val;
-  OutputType(int v) : val(v) {}
+  int valu;
+  OutputType(int v) : valu(v) {}
 };
 
 // Raw literal

Examples/test-suite/ocaml/Makefile.in

@@ -17,6 +17,8 @@ FAILING_CPP_TESTS = \
 allprotected \
 apply_signed_char \
 apply_strings \
+cpp11_director_enums \
+cpp11_strongly_typed_enumerations \
 cpp_enum \
 default_constructor \
 director_binary_string \