Avoid including threads.h in the example helpers

examples/alrecord.c

@@ -27,6 +27,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <errno.h>
 #include <math.h>
 
 #include "AL/al.h"

examples/common/alhelpers.c

@@ -29,6 +29,7 @@
  * channel configs and sample types. */
 
 #include <stdio.h>
+#include <errno.h>
 #include <string.h>
 
 #include "AL/al.h"

examples/common/alhelpers.h

@@ -1,15 +1,15 @@
 #ifndef ALHELPERS_H
 #define ALHELPERS_H
 
+#include <time.h>
+
 #include "AL/alc.h"
 #include "AL/al.h"
 #include "AL/alext.h"
 
-#include "threads.h"
-
 #ifdef __cplusplus
 extern "C" {
-#endif /* __cplusplus */
+#endif
 
 /* Some helper functions to get the name from the format enums. */
 const char *FormatName(ALenum type);
@@ -30,7 +30,7 @@ int altimespec_get(struct timespec *ts, int base);
 void al_nssleep(unsigned long nsec);
 
 #ifdef __cplusplus
-}
-#endif /* __cplusplus */
+} // extern "C"
+#endif
 
 #endif /* ALHELPERS_H */