pthread: Rename thread_init to avoid symbol collision

The AIX threads library exposes a function with the same name.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/pthread.c

@@ -234,7 +234,7 @@ static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, v
     return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
 }
 
-static int thread_init(AVCodecContext *avctx)
+static int thread_init_internal(AVCodecContext *avctx)
 {
     int i;
     ThreadContext *c;
@@ -1000,7 +1000,7 @@ int ff_thread_init(AVCodecContext *avctx)
     validate_thread_parameters(avctx);
 
     if (avctx->active_thread_type&FF_THREAD_SLICE)
-        return thread_init(avctx);
+        return thread_init_internal(avctx);
     else if (avctx->active_thread_type&FF_THREAD_FRAME)
         return frame_thread_init(avctx);
 

libavfilter/pthread.c

@@ -144,7 +144,7 @@ static int thread_execute(AVFilterContext *ctx, action_func *func,
     return 0;
 }
 
-static int thread_init(ThreadContext *c, int nb_threads)
+static int thread_init_internal(ThreadContext *c, int nb_threads)
 {
     int i, ret;
 
@@ -207,7 +207,7 @@ int ff_graph_thread_init(AVFilterGraph *graph)
     if (!graph->internal->thread)
         return AVERROR(ENOMEM);
 
-    ret = thread_init(graph->internal->thread, graph->nb_threads);
+    ret = thread_init_internal(graph->internal->thread, graph->nb_threads);
     if (ret <= 1) {
         av_freep(&graph->internal->thread);
         graph->thread_type = 0;