Revert https://github.com/winft/disman/commit/78771e145b7f
and    https://github.com/winft/disman/commit/18d0a3aa7940
to support disabling build dependencies at configure (CMake) time.

In file included from backends/wayland/waylandscreen.cpp:20:
backends/wayland/waylandoutput.h:24:10: fatal error: 'Wrapland/Client/registry.h' file not found
#include <Wrapland/Client/registry.h>
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

--- backends/CMakeLists.txt.orig	2024-02-27 13:20:11 UTC
+++ backends/CMakeLists.txt
@@ -37,5 +37,9 @@ add_subdirectory(qscreen)
 ####################################################################################################
 add_subdirectory(fake)
 add_subdirectory(qscreen)
+if(Wrapland_FOUND)
 add_subdirectory(wayland)
+endif()
+if(XCB_RANDR_FOUND)
 add_subdirectory(xrandr)
+endif()