Make test/cxxflags use a user define instead of __OPTIMIZE__

test/cxxflags/cxxflags.cc

Index: test/cxxflags/cxxflags.cc
diff --git a/test/cxxflags/cxxflags.cc b/test/cxxflags/cxxflags.cc
index c1e2452070c7672933668663a2bb1c2b48828985..44b299c72d57fd56b077be17ba4e518487b60d5c 100644
--- a/test/cxxflags/cxxflags.cc
+++ b/test/cxxflags/cxxflags.cc
@@ -6,10 +6,10 @@
 
 int main(int argc, char *argv[])
 {
-#ifdef __OPTIMIZE__
-  printf("Using an optimization flag\n");
+#ifdef ABC
+  printf("With define\n");
 #else
-  printf("Using no optimization flag\n");
+  printf("No define\n");
 #endif
   return 0;
 }