Add missing test case

tests/testsuite/test-via/test_ada.c

+#include <math.h>
+#include <stdio.h>
+
+/* Ada code external interface */
+extern void challenge_PI_run();
+extern void challenge_PI_any_one();
+extern int adainit();
+
+//extern long long l_result;
+
+/* Provide code called by the Ada state machine as external procedure */
+void challenge_RI_pow(long long *a, long long *b, long long *res)
+{
+    *res = (long long)pow((double)*a, (double)*b);
+}
+
+int main()
+{
+    adainit();
+    challenge_PI_run();
+    challenge_PI_run();
+    //printf("Internal state: %lld\n", l_result);
+    challenge_PI_any_one();
+    challenge_PI_run();
+    
+    return 0;
+}
+