BuildSystem: Rework the whole cmake build system

Now files are installed using the install() command instead of manually
copying files to their destinations. This allows automatic recompilation
of headers that did not work previously

userspace/u8sum/CMakeLists.txt

@@ -1,16 +1,8 @@
-cmake_minimum_required(VERSION 3.26)
-
-project(u8sum CXX)
-
 set(SOURCES
 	main.cpp
 )
 
 add_executable(u8sum ${SOURCES})
-target_compile_options(u8sum PUBLIC -O2 -g)
-target_link_libraries(u8sum PUBLIC libc)
+banan_link_library(u8sum libc)
 
-add_custom_target(u8sum-install
-	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/u8sum ${BANAN_BIN}/
-	DEPENDS u8sum
-)
+install(TARGETS u8sum)