BuildSystem: Install base sysroot only once

Base sysroot is not only installed when creating the syroot directory
for the first time. To get it installed again, you have to either delete
the old sysroot diretory or run clean target

This makes it so its actually possible to edit files specified in the
base sysroot without random hacks.

userspace/libraries/LibC/CMakeLists.txt

@@ -58,7 +58,6 @@ target_compile_options(objlibc PUBLIC -Wall -Wextra -Werror -Wno-error=stack-usa
 function(add_crtx crtx)
 	add_custom_target(${crtx}
 		COMMAND ${CMAKE_CXX_COMPILER} -c -o ${CMAKE_INSTALL_LIBDIR}/${crtx}.o ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/${crtx}.S
-		DEPENDS sysroot
 	)
 	add_dependencies(objlibc ${crtx})
 endfunction()