Fix test run.

tests/ttysolitaire_test.c

@@ -1,10 +1,14 @@
 #include "ttysolitaire_test.h"
+#include "../src/game.h"
 
 const char *program_name;
+struct game game;
 
 int main(int argc, const char *argv[]) {
   program_name = argv[0];
 
+  (void) argc;
+
   test_card();
   test_cursor();
   test_deck();