This allows libc to not require __gxx_personality_v0. I can maybe add
C++ back to libc... :D I don't know why I did not research earlier what
this symbols was used for
crt files for userspace are now a dependency of libc, which means that
everytime libc gets installed, crt files will also install.
This fixes the problem when building libc
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