Define _WIN32_WINNT on the command line with _WIN32

Alc/backends/dsound.c

@@ -20,7 +20,6 @@
 
 #include "config.h"
 
-#define _WIN32_WINNT 0x0500
 #include <stdlib.h>
 #include <stdio.h>
 #include <memory.h>

Alc/backends/mmdevapi.c

@@ -21,7 +21,6 @@
 #include "config.h"
 
 #define COBJMACROS
-#define _WIN32_WINNT 0x0500
 #include <stdlib.h>
 #include <stdio.h>
 #include <memory.h>

Alc/backends/winmm.c

@@ -20,7 +20,6 @@
 
 #include "config.h"
 
-#define _WIN32_WINNT 0x0500
 #include <stdlib.h>
 #include <stdio.h>
 #include <memory.h>

CMakeLists.txt

@@ -61,7 +61,7 @@ OPTION(ALSOFT_CONFIG "Install alsoft.conf configuration file" OFF)
 
 IF(WIN32)
     SET(LIBNAME OpenAL32)
-    ADD_DEFINITIONS("-D_WIN32")
+    ADD_DEFINITIONS("-D_WIN32 -D_WIN32_WINNT=0x0500")
 ELSE()
     SET(LIBNAME openal)
 ENDIF()

OpenAL32/Include/alMain.h

@@ -163,9 +163,6 @@ typedef ptrdiff_t ALsizeiptrEXT;
 
 #ifdef _WIN32
 
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0500
-#endif
 #include <windows.h>
 
 typedef DWORD pthread_key_t;