GTK4: Change configure tests, and try to support webkit. Try gtk4-x11 first then just gtk4 (wayland)... so if the X11 version is available we can use Xlib functions if on the X11 backend. If requesting GTK4 use webkitgtk-5.0 the package reported for GTK4. I was unable to build webkit for GTK4 due to dependency nightmares. Will try to build it on Fedora and see if I can actuall test this.

prefix=@prefix@
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${exec_prefix}/include
 
Name: dwindows
Description: Dynamic Windows Cross platform UI Toolkit
Version: @VERSION@
Libs: -L${prefix}/lib -ldwindows @LIBS@
Cflags: -I${prefix}/include @CFLAGS@ -D@DW_DEFINE@