Don't include pthread.h if threading is disabled.

miniaudio.h

@@ -3874,6 +3874,7 @@ typedef ma_uint16 wchar_t;
 #if !defined(_WIN32)    /* If it's not Win32, assume POSIX. */
     #define MA_POSIX
 
+    #if !defined(MA_NO_THREADING)
         /*
         Use the MA_NO_PTHREAD_IN_HEADER option at your own risk. This is intentionally undocumented.
         You can use this to avoid including pthread.h in the header section. The downside is that it
@@ -3891,6 +3892,7 @@ typedef ma_uint16 wchar_t;
             typedef union           ma_pthread_mutex_t { char __data[40]; ma_uint64 __alignment; } ma_pthread_mutex_t;
             typedef union           ma_pthread_cond_t  { char __data[48]; ma_uint64 __alignment; } ma_pthread_cond_t;
         #endif
+    #endif
 
     #if defined(__unix__)
         #define MA_UNIX
@@ -11547,14 +11549,14 @@ IMPLEMENTATION
 #endif
 
 #if !defined(MA_WIN32)
+    #if !defined(MA_NO_THREADING)
         #include <sched.h>
-#include <sys/time.h>   /* select() (used for ma_sleep()). */
+        #include <pthread.h>     /* For pthreads. */
-#include <unistd.h>
-#include <pthread.h>
     #endif
 
-#ifdef MA_NX
+    #include <sys/time.h>   /* select() (used for ma_sleep()). */
     #include <time.h>       /* For nanosleep() */
+    #include <unistd.h> 
 #endif
 
 #include <sys/stat.h>   /* For fstat(), etc. */