Added missing file.

test cases/common/16 configure file/prog.c

@@ -0,0 +1,14 @@
+#include <string.h>
+#include "config.h"
+
+#ifdef SHOULD_BE_UNDEF
+#error "FAIL!"
+#endif
+
+int main(int argc, char **argv) {
+#ifndef BE_TRUE
+    return 1;
+#else
+    return strcmp(MESSAGE, "mystring");
+#endif
+}