Fix Android bulid issue

Author: fmz

ggml/src/ggml.c

@@ -115,8 +115,14 @@ static int sched_yield (void) {
     return 0;
 }
 #else
+
+#ifndef __USE_GNU
+#define __USE_GNU
+#endif
+
 #include <pthread.h>
 #include <stdatomic.h>
+#include <sched.h>
 
 typedef void * thread_ret_t;
 
@@ -18779,11 +18785,6 @@ static bool __thread_priority(int32_t prio) {
 
 #else // posix?
 
-#ifndef __USE_GNU
-#define __USE_GNU
-#endif
-#include <sched.h>
-
 static bool __thread_affinity(const bool * mask) {
     cpu_set_t cpuset;
     int32_t err;