Try to find the X11 XCB compatibility library.

This will define the following variables:

True if (the requested version of) libX11-xcb is available
The version of libX11-xcb (this is not guaranteed to be set even when X11_XCB_FOUND is true)
This can be passed to target_link_libraries() instead of the EGL::EGL target
This should be passed to target_include_directories() if the target is not used for linking
This should be passed to target_compile_options() if the target is not used for linking

If X11_XCB_FOUND is TRUE, it will also define the following imported target:

The X11 XCB compatibility library

In general we recommend using the imported target, as it is easier to use. Bear in mind, however, that if the target is in the link interface of an exported library, it must be made available by the package config file.

Since pre-1.0.0.