Put readonly data into text segment.

test/test_combinatorics_c.c

@@ -61,8 +61,9 @@ main()
   int tid = 0;
   uint32_t *list;
   size_t n;
-  struct PPM_iinterval nrange = { 5, 10 };
-  uint32_t numRunsList[] = { 1000, 10000, 100000, 1000000, 10000000 };
+  static const struct PPM_iinterval nrange = { 5, 10 };
+  static const uint32_t numRunsList[]
+    = { 1000, 10000, 100000, 1000000, 10000000 };
 
   fprintf(stderr, "%d: random seed=%u\n", tid, random_seed);