Add at least a very minimal run test for std::vector

The test is trivial, but still better than nothing.

Examples/test-suite/c/li_std_vector_runme.c

@@ -0,0 +1,22 @@
+#include "li_std_vector/li_std_vector_wrap.h"
+#include <assert.h>
+
+int main() {
+    size_t i;
+
+    IntVector* iv = IntVector_new();
+    assert( IntVector_size(iv) == 0 );
+
+    IntVector_push_back(iv, 1);
+    IntVector_push_back(iv, 4);
+    IntVector_push_back(iv, 9);
+    assert( IntVector_size(iv) == 3 );
+
+    for ( i = 0; i < 3; i++ ) {
+        assert( IntVector_get(iv, i) == (i + 1)*(i + 1) );
+    }
+
+    IntVector_delete(iv);
+
+    return 0;
+}