Fix wrong type causing build failure on windows.

storage/xtradb/include/srv0srv.h

@@ -243,7 +243,7 @@ extern long long	srv_ibuf_max_size;
 extern ulong	srv_ibuf_active_contract;
 extern ulong	srv_ibuf_accel_rate;
 extern ulint	srv_checkpoint_age_target;
-extern ulint	srv_flush_neighbor_pages;
+extern ulong	srv_flush_neighbor_pages;
 extern ulint	srv_deprecated_enable_unsafe_group_commit;
 extern ulong	srv_read_ahead;
 extern ulong	srv_adaptive_flushing_method;

storage/xtradb/srv/srv0srv.c

@@ -446,7 +446,7 @@ UNIV_INTERN ulong	srv_ibuf_accel_rate = 100;
 #define PCT_IBUF_IO(pct) ((ulint) (srv_io_capacity * srv_ibuf_accel_rate * ((double) pct / 10000.0)))
 
 UNIV_INTERN ulint	srv_checkpoint_age_target = 0;
-UNIV_INTERN ulint	srv_flush_neighbor_pages = 1; /* 0:disable 1:area 2:contiguous */
+UNIV_INTERN ulong	srv_flush_neighbor_pages = 1; /* 0:disable 1:area 2:contiguous */
 
 UNIV_INTERN ulint	srv_deprecated_enable_unsafe_group_commit = 0;
 UNIV_INTERN ulong	srv_read_ahead = 3; /* 1: random  2: linear  3: Both */