Update libmaxminddb and MySQL 5.7 (#2192)

* Update libmaxminddb and MySQL 5.7 (linux checkout)

* Bump libmaxminddb version

* Typo fix

extensions/geoip/data-pool.c

@@ -1,12 +1,14 @@
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
+
 #include "data-pool.h"
 #include "maxminddb.h"
 
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdlib.h>
 
-static bool can_multiply(size_t const, size_t const, size_t const);
-
 // Allocate an MMDB_data_pool_s. It initially has space for size
 // MMDB_entry_data_list_s structs.
 MMDB_data_pool_s *data_pool_new(size_t const size) {
@@ -39,7 +41,7 @@ MMDB_data_pool_s *data_pool_new(size_t const size) {
 // the given max. max will typically be SIZE_MAX.
 //
 // We want to know if we'll wrap around.
-static bool can_multiply(size_t const max, size_t const m, size_t const n) {
+bool can_multiply(size_t const max, size_t const m, size_t const n) {
     if (m == 0) {
         return false;
     }

extensions/geoip/data-pool.h

@@ -44,6 +44,7 @@ typedef struct MMDB_data_pool_s {
     MMDB_entry_data_list_s *blocks[DATA_POOL_NUM_BLOCKS];
 } MMDB_data_pool_s;
 
+bool can_multiply(size_t const, size_t const, size_t const);
 MMDB_data_pool_s *data_pool_new(size_t const);
 void data_pool_destroy(MMDB_data_pool_s *const);
 MMDB_entry_data_list_s *data_pool_alloc(MMDB_data_pool_s *const);

extensions/geoip/maxminddb-compat-util.h

@@ -42,9 +42,9 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-static void *
+static const void *
 mmdb_memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
-    register char *cur, *last;
+    const char *cur, *last;
     const char *cl = (const char *)l;
     const char *cs = (const char *)s;
 
@@ -61,9 +61,9 @@ mmdb_memmem(const void *l, size_t l_len, const void *s, size_t s_len) {
         return memchr(l, (int)*cs, l_len);
 
     /* the last position where its possible to find "s" in "l" */
-    last = (char *)cl + l_len - s_len;
+    last = cl + l_len - s_len;
 
-    for (cur = (char *)cl; cur <= last; cur++)
+    for (cur = cl; cur <= last; cur++)
         if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
             return cur;