make sure c++11 is available for tests

Author: ptorrestr

libhdt/tests/Makefile.am

@@ -1,6 +1,7 @@
 check_PROGRAMS = \
 bit375 \
 bitutiltest \
+c11 \
 listener \
 logarr \
 serd \

libhdt/tests/c11.cpp

@@ -0,0 +1,10 @@
+#include <tuple>
+
+int
+main(int argc, char **argv)
+{
+	std::tuple<int, int> t = { 1, 1};
+	std::tuple<int, int> u;
+	t.swap(u);
+	return 0;
+}