Avoid including voice.h in alcontext.h

al/source.h

@@ -16,6 +16,7 @@
 #include "alu.h"
 #include "math_defs.h"
 #include "vector.h"
+#include "voice.h"
 
 struct ALbuffer;
 struct ALeffectslot;

al/state.cpp

@@ -43,6 +43,7 @@
 #include "inprogext.h"
 #include "opthelpers.h"
 #include "strutils.h"
+#include "voice.h"
 
 
 namespace {

alc/alcontext.h

@@ -23,14 +23,15 @@
 #include "threads.h"
 #include "vecmat.h"
 #include "vector.h"
-#include "voice.h"
 
 struct ALeffectslot;
 struct ALsource;
 struct EffectSlot;
 struct EffectSlotProps;
 struct RingBuffer;
+struct Voice;
 struct VoiceChange;
+struct VoicePropsItem;
 
 
 enum class DistanceModel : unsigned char {

alc/effects/convolution.cpp

@@ -20,6 +20,7 @@
 #include "core/logging.h"
 #include "effects/base.h"
 #include "effectslot.h"
+#include "math_defs.h"
 #include "polyphase_resampler.h"
 
 

alc/effects/fshifter.cpp

@@ -31,6 +31,8 @@
 #include "alcontext.h"
 #include "alu.h"
 #include "effectslot.h"
+#include "math_defs.h"
+
 
 namespace {
 

alc/effects/pshifter.cpp

@@ -32,6 +32,7 @@
 #include "alnumeric.h"
 #include "alu.h"
 #include "effectslot.h"
+#include "math_defs.h"
 
 
 namespace {

alc/effects/vmorpher.cpp

@@ -29,6 +29,8 @@
 #include "alcontext.h"
 #include "alu.h"
 #include "effectslot.h"
+#include "math_defs.h"
+
 
 namespace {