Docs: Remove mentions of extra-cmake-modules

README.md

@@ -88,9 +88,6 @@ in the documentation for more information.
 GLFW itself needs only CMake 3.1 or later and the headers and libraries for your
 OS and window system.
 
-The (experimental) Wayland backend also depends on the `extra-cmake-modules`
-package, which is used to generate Wayland protocol headers.
-
 The examples and test programs depend on a number of tiny libraries.  These are
 located in the `deps/` directory.
 

docs/compile.dox

@@ -103,8 +103,7 @@ To compile GLFW for Wayland, you need to have the Wayland packages installed,
 as well as the basic development tools like GCC and make.  For example, on
 Ubuntu and other distributions based on Debian GNU/Linux, you need to install
 the `libwayland-dev` package, which contains all Wayland headers and pulls in
-wayland-scanner, as well as the `wayland-protocols` and `extra-cmake-modules`
-packages.
+wayland-scanner, as well as the `wayland-protocols` package.
 
 Once you have installed the necessary packages, move on to @ref
 compile_generate.