ext/mstring: make rare_codepoint_bitvec const

Author: MaxKellermann

ext/mbstring/gen_rare_cp_bitvec.php

@@ -40,7 +40,7 @@
  * as less likely to be the correct one.
  */
 
-static uint32_t rare_codepoint_bitvec[] = {
+static const uint32_t rare_codepoint_bitvec[] = {
 HEADER;
 
 for ($i = 0; $i < 0xFFFF / 32; $i++) {

ext/mbstring/rare_cp_bitvec.h

@@ -9,7 +9,7 @@
  * as less likely to be the correct one.
  */
 
-static uint32_t rare_codepoint_bitvec[] = {
+static const uint32_t rare_codepoint_bitvec[] = {
 0xffffd9ff, 0x00000000, 0x00000000, 0x80000000, 0xffffffff, 0x00002001, 0x00000000, 0x00000000,
 0x70ff0f0f, 0xfffcffff, 0x70fcfe61, 0x81fc3fcc, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,