MBUG#452116: MariaDB: mysql_install_db causes server segfault

- Increase thread_stack_size on 64-bit platforms to 240K, so that 
  it can accomodate the HA_CHECK structure which is 130K.

mysys/my_init.c

@@ -42,7 +42,8 @@ static void netware_init();
 
 my_bool my_init_done= 0;
 uint	mysys_usage_id= 0;              /* Incremented for each my_init() */
-ulong   my_thread_stack_size= 65536;
+
+ulong   my_thread_stack_size= (sizeof(void*) <= 4)? 65536: ((256-16)*1024);
 
 static ulong atoi_octal(const char *str)
 {

sql/mysqld.cc

@@ -7170,7 +7170,7 @@ The minimum value for this variable is 4096.",
   {"thread_stack", OPT_THREAD_STACK,
    "The stack size for each thread.", (uchar**) &my_thread_stack_size,
    (uchar**) &my_thread_stack_size, 0, GET_ULONG, REQUIRED_ARG,DEFAULT_THREAD_STACK,
-   1024L*128L, (longlong) ULONG_MAX, 0, 1024, 0},
+   (sizeof(void*)<=4)?1024L*128L: ((256-16)*1024L), (longlong) ULONG_MAX, 0, 1024, 0},
   { "time_format", OPT_TIME_FORMAT,
     "The TIME format (for future).",
     (uchar**) &opt_date_time_formats[MYSQL_TIMESTAMP_TIME],

support-files/my-innodb-heavy-4G.cnf.sh

@@ -174,7 +174,7 @@ default-storage-engine = MYISAM
 # memory, while if you use your own stack hungry UDF functions or your
 # OS requires more stack for some operations, you might need to set this
 # to a higher value.
-thread_stack = 192K
+thread_stack = 240K
 
 # Set the default transaction isolation level. Levels available are:
 # READ-UNCOMMITTED, READ-COMMITTED, REPEATABLE-READ, SERIALIZABLE

support-files/my-small.cnf.sh

@@ -34,7 +34,7 @@ sort_buffer_size = 64K
 read_buffer_size = 256K
 read_rnd_buffer_size = 256K
 net_buffer_length = 2K
-thread_stack = 128K
+thread_stack = 240K
 
 # Don't listen on a TCP/IP port at all. This can be a security enhancement,
 # if all processes that need to connect to mysqld run on the same host.