Remove some hopefully unneeded macros

CMakeLists.txt

@@ -91,7 +91,7 @@ SET(LINKER_FLAGS )
 SET(EXTRA_LIBS )
 
 IF(WIN32)
-    SET(CPP_DEFS ${CPP_DEFS} _WIN32 _WIN32_WINNT=0x0502)
+    SET(CPP_DEFS ${CPP_DEFS} _WIN32)
 
     OPTION(ALSOFT_BUILD_ROUTER  "Build the router (EXPERIMENTAL; creates OpenAL32.dll and soft_oal.dll)"  OFF)
 
@@ -851,9 +851,6 @@ IF(WIN32)
         get_windowssdk_include_dirs(${WINDOWSSDK_PREFERRED_DIR} WINSDK_INCLUDE_DIRS)
     ENDIF()
 
-    SET(OLD_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS})
-    SET(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_WIN32_WINNT=0x0502)
-
     # Check MMSystem backend
     CHECK_INCLUDE_FILES("windows.h;mmsystem.h" HAVE_MMSYSTEM_H)
     FIND_LIBRARY(WINMM_LIBRARY NAMES winmm
@@ -892,9 +889,6 @@ IF(WIN32)
             SET(ALC_OBJS  ${ALC_OBJS} alc/backends/wasapi.cpp alc/backends/wasapi.h)
         ENDIF()
     ENDIF()
-
-    SET(CMAKE_REQUIRED_DEFINITIONS ${OLD_REQUIRED_DEFINITIONS})
-    UNSET(OLD_REQUIRED_DEFINITIONS)
 ENDIF()
 IF(ALSOFT_REQUIRE_WINMM AND NOT HAVE_WINMM)
     MESSAGE(FATAL_ERROR "Failed to enabled required WinMM backend")

alc/alconfig.cpp

@@ -18,14 +18,6 @@
  * Or go to http://www.gnu.org/copyleft/lgpl.html
  */
 
-#ifdef _WIN32
-#ifdef __MINGW32__
-#define _WIN32_IE 0x501
-#else
-#define _WIN32_IE 0x400
-#endif
-#endif
-
 #include "config.h"
 
 #include "alconfig.h"
@@ -33,7 +25,7 @@
 #include <cstdlib>
 #include <cctype>
 #include <cstring>
-#ifdef _WIN32_IE
+#ifdef _WIN32
 #include <windows.h>
 #include <shlobj.h>
 #endif

alc/helpers.cpp

@@ -18,17 +18,6 @@
  * Or go to http://www.gnu.org/copyleft/lgpl.html
  */
 
-/* Define this first since Windows' system headers may include headers affected
- * by it (is it even still needed?).
- */
-#ifdef _WIN32
-#ifdef __MINGW32__
-#define _WIN32_IE 0x501
-#else
-#define _WIN32_IE 0x400
-#endif
-#endif
-
 #include "config.h"
 
 #include <algorithm>