Fix wxFD_CLR() definition for Intel compiler under Linux.

wxFD_CLR() should be void, not bool.

Closes #11517.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62790 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/fd.h

@@ -37,11 +37,11 @@
         return FD_ISSET(fd, fds);
         #pragma warning(pop)
     }
-    inline bool wxFD_CLR(int fd, fd_set *fds)
+    inline void wxFD_CLR(int fd, fd_set *fds)
     {
         #pragma warning(push, 1)
         #pragma warning(disable:1469)
-        return FD_CLR(fd, fds);
+        FD_CLR(fd, fds);
         #pragma warning(pop)
     }
 #else // !__INTELC__