Clean up includes a bit

Trying out the IWYU tool to only include what's necessary in a given file.
Seems to work decently (it'll miss some headers, suggest unnecessary ones, and
make nonsense suggestions for some things, but overall gives a good starting
point), and helps clean out some headers.

1 files changed, 6 insertions, 4 deletions

diff --git a/Alc/hrtf.h b/Alc/hrtf.h
index 72533cc1..6c41cb82 100644
--- a/Alc/hrtf.h
+++ b/Alc/hrtf.h
@@ -2,15 +2,19 @@
 #define ALC_HRTF_H
 
 #include <array>
+#include <cstddef>
 #include <memory>
 #include <string>
 
 #include "AL/al.h"
-#include "AL/alc.h"
 
-#include "vector.h"
 #include "almalloc.h"
+#include "ambidefs.h"
+#include "atomic.h"
+#include "vector.h"
+
 
+struct HrtfHandle;
 
 #define HRTF_HISTORY_BITS   (6)
 #define HRTF_HISTORY_LENGTH (1<<HRTF_HISTORY_BITS)
@@ -21,8 +25,6 @@
 #define HRIR_MASK        (HRIR_LENGTH-1)
 
 
-struct HrtfHandle;
-
 struct HrtfEntry {
     RefCount ref;