* gnu/packages/guile-xyz.scm (guile-smc): Update to 0.5.2.
[arguments]: Remove the patch phase that is not needed anymore.
Remove a trailing #t in the wrap-program phase.
[native-inputs]: Add "help2man" and "which".
[inputs]: Use the new inputs style.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>