rename thread_init to avoid runtime failure on AIX

patch by 'gwachter'

Author: dormando

memcached.c

@@ -5540,7 +5540,7 @@ int main (int argc, char **argv) {
         exit(EX_OSERR);
     }
     /* start up worker threads if MT mode */
-    thread_init(settings.num_threads, main_base);
+    memcached_thread_init(settings.num_threads, main_base);
 
     if (start_assoc_maintenance_thread() == -1) {
         exit(EXIT_FAILURE);

memcached.h

@@ -547,7 +547,7 @@ static inline int mutex_lock(pthread_mutex_t *mutex)
  * also #define-d to directly call the underlying code in singlethreaded mode.
  */
 
-void thread_init(int nthreads, struct event_base *main_base);
+void memcached_thread_init(int nthreads, struct event_base *main_base);
 int  dispatch_event_add(int thread, conn *c);
 void dispatch_conn_new(int sfd, enum conn_states init_state, int event_flags, int read_buffer_size, enum network_transport transport);
 

thread.c

@@ -370,7 +370,7 @@ static void setup_thread(LIBEVENT_THREAD *me) {
 static void *worker_libevent(void *arg) {
     LIBEVENT_THREAD *me = arg;
 
-    /* Any per-thread setup can happen here; thread_init() will block until
+    /* Any per-thread setup can happen here; memcached_thread_init() will block until
      * all threads have finished initializing.
      */
 
@@ -778,7 +778,7 @@ void slab_stats_aggregate(struct thread_stats *stats, struct slab_stats *out) {
  * nthreads  Number of worker event handler threads to spawn
  * main_base Event base for main thread
  */
-void thread_init(int nthreads, struct event_base *main_base) {
+void memcached_thread_init(int nthreads, struct event_base *main_base) {
     int         i;
     int         power;