shell32: Load wine_get_build_id() dynamically.

dlls/shell32/shell32_main.c

@@ -810,10 +810,12 @@ static INT_PTR CALLBACK AboutDlgProc( HWND hWnd, UINT msg, WPARAM wParam,
         {
             ABOUT_INFO *info = (ABOUT_INFO *)lParam;
             WCHAR template[512], buffer[512], version[64];
-            extern const char *wine_get_build_id(void);
+            const char *(CDECL *wine_get_build_id)(void);
 
             if (info)
             {
+                wine_get_build_id = (void *)GetProcAddress( GetModuleHandleA("ntdll.dll"),
+                                                            "wine_get_build_id");
                 SendDlgItemMessageW(hWnd, stc1, STM_SETICON,(WPARAM)info->hIcon, 0);
                 GetWindowTextW( hWnd, template, ARRAY_SIZE(template) );
                 sprintfW( buffer, template, info->szApp );
@@ -822,9 +824,12 @@ static INT_PTR CALLBACK AboutDlgProc( HWND hWnd, UINT msg, WPARAM wParam,
                 SetWindowTextW( GetDlgItem(hWnd, IDC_ABOUT_STATIC_TEXT2), info->szOtherStuff );
                 GetWindowTextW( GetDlgItem(hWnd, IDC_ABOUT_STATIC_TEXT3),
                                 template, ARRAY_SIZE(template) );
-                MultiByteToWideChar( CP_UTF8, 0, wine_get_build_id(), -1, version, ARRAY_SIZE(version) );
-                sprintfW( buffer, template, version );
-                SetWindowTextW( GetDlgItem(hWnd, IDC_ABOUT_STATIC_TEXT3), buffer );
+                if (wine_get_build_id)
+                {
+                    MultiByteToWideChar( CP_UTF8, 0, wine_get_build_id(), -1, version, ARRAY_SIZE(version) );
+                    sprintfW( buffer, template, version );
+                    SetWindowTextW( GetDlgItem(hWnd, IDC_ABOUT_STATIC_TEXT3), buffer );
+                }
                 hWndCtl = GetDlgItem(hWnd, IDC_ABOUT_LISTBOX);
                 SendMessageW( hWndCtl, WM_SETREDRAW, 0, 0 );
                 SendMessageW( hWndCtl, WM_SETFONT, (WPARAM)info->hFont, 0 );