BuildSystem: using sysroot doesn't need root privileges anymore!

Sysroot is now created with fakeroot. This allows root access to be
only needed for disk image creation, since it uses loopback devices.

LibELF/CMakeLists.txt

@@ -3,9 +3,8 @@ cmake_minimum_required(VERSION 3.26)
 project(LibELF CXX)
 
 add_custom_target(libelf-headers
-	COMMAND sudo rsync -a ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
+	COMMAND ${CMAKE_COMMAND} -E copy_directory_if_different ${CMAKE_CURRENT_SOURCE_DIR}/include/ ${BANAN_INCLUDE}/
 	DEPENDS sysroot
-	USES_TERMINAL
 )
 
 add_custom_target(libelf-install