include: Remove DECLSPEC_HIDDEN definition.

dlls/dnsapi/dnsapi.h

@@ -97,7 +97,7 @@ static inline char *strdup_ua( const char *src )
     return dst;
 }
 
-extern const char *debugstr_type( unsigned short ) DECLSPEC_HIDDEN;
+extern const char *debugstr_type( unsigned short );
 
 struct get_searchlist_params
 {

dlls/win32u/ntuser_private.h

@@ -247,7 +247,7 @@ extern void free_dce( struct dce *dce, HWND hwnd );
 extern void invalidate_dce( WND *win, const RECT *extra_rect );
 
 /* message.c */
-extern BOOL set_keyboard_auto_repeat( BOOL enable ) DECLSPEC_HIDDEN;
+extern BOOL set_keyboard_auto_repeat( BOOL enable );
 
 /* window.c */
 HANDLE alloc_user_handle( struct user_object *ptr, unsigned int type );

include/winnt.h

@@ -51,16 +51,16 @@ extern "C" {
 #define NTAPI __stdcall
 #define FASTCALL __fastcall
 
-#ifndef MIDL_PASS
+#ifndef DECLSPEC_IMPORT
 # if defined(_MSC_VER)
 #  define DECLSPEC_IMPORT __declspec(dllimport)
 # elif defined(__MINGW32__) || defined(__CYGWIN__)
 #  define DECLSPEC_IMPORT __attribute__((dllimport))
+# elif defined(__GNUC__)
+#  define DECLSPEC_IMPORT __attribute__((visibility ("hidden")))
 # else
-#  define DECLSPEC_IMPORT DECLSPEC_HIDDEN
+#  define DECLSPEC_IMPORT
 # endif
-#else
-# define DECLSPEC_IMPORT
 #endif
 
 #ifndef DECLSPEC_NORETURN
@@ -193,16 +193,6 @@ extern "C" {
 # define DECLSPEC_EXPORT
 #endif
 
-#ifndef DECLSPEC_HIDDEN
-# if defined(_MSC_VER) || defined(__MINGW32__) || defined(__CYGWIN__) || defined(__sun)
-#  define DECLSPEC_HIDDEN
-# elif defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
-#  define DECLSPEC_HIDDEN __attribute__((visibility ("hidden")))
-# else
-#  define DECLSPEC_HIDDEN
-# endif
-#endif
-
 #ifndef __has_attribute
 # define __has_attribute(x) 0
 #endif