Fix OpenAL on UNIX by wrapping the Windows headers with __WINDOWS__ (AL/al.h),

the OS X headers with __APPLE__ (OpenAL/AL.h).  The default will be the UNIX
location (AL/a.h).

Originally committed to SVN as r1908.

aegisub/audio_player_openal.cpp

@@ -47,12 +47,16 @@
 #include "frame_main.h"
 #include "audio_player_openal.h"
 #include "options.h"
-#ifdef __APPLE__
+
+#ifdef __WINDOWS__
+#include <al.h>
+#include <alc.h>
+#elif defined(__APPLE__)
 #include <OpenAL/AL.h>
 #include <OpenAL/ALC.h>
 #else
-#include <al.h>
-#include <alc.h>
+#include <AL/al.h>
+#include <AL/alc.h>
 #endif
 
 

aegisub/audio_player_openal.h

@@ -47,12 +47,16 @@
 #include "frame_main.h"
 #include "audio_player.h"
 #include "options.h"
-#ifdef __APPLE__
+
+#ifdef __WINDOWS__
+#include <al.h>
+#include <alc.h>
+#elif defined(__APPLE__)
 #include <OpenAL/AL.h>
 #include <OpenAL/ALC.h>
 #else
-#include <al.h>
-#include <alc.h>
+#include <AL/al.h>
+#include <AL/alc.h>
 #endif