Don't advise people to make new libraries standard.

Update the instructions for adding the new library to not recommend to make
the new library standard, this is rarely, if ever, needed.

See #16291.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76615 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Don't include "webview" in "standard" libraries.

This means `wx-config --libs` doesn't include webview in its output by default
any longer, it must be explicitly requested.

Closes #16291.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76616 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775