fpicker: global default _WIN32_WINNT is sufficient now

Remove local overrides.

Change-Id: I588b6543848f962d7533c49b138bc6d836fe5c47

fpicker/Library_fps.mk

@@ -25,8 +25,6 @@ $(eval $(call gb_Library_use_sdk_api,fps))
 $(eval $(call gb_Library_add_defs,fps,\
 	-D_UNICODE \
 	-DUNICODE \
-	-U_WIN32_WINNT \
-	-D_WIN32_WINNT=0x0600 \
 ))
 
 $(eval $(call gb_Library_use_libraries,fps,\

fpicker/source/win32/filepicker/platform_vista.h

@@ -22,15 +22,8 @@
 
 #pragma once
 
-// Change these values to use different versions
-#undef WINVER
-#undef _WIN32_WINNT
-#undef _WIN32_IE
 #undef _WTL_NO_CSTRING
 
-#define WINVER          0x0600
-#define _WIN32_WINNT    0x0600
-#define _WIN32_IE       0x0700
 #define _WTL_NO_CSTRING
 
 #if defined _MSC_VER