Improve patching step

  cd linux

  # apply patches

  for _f in "${source[@]}"; do

    if [[ "$_f" =~ \.patch$ ]]; then

      msg2 "Patching $_f"

      patch -p1 < "$srcdir/$_f"

    fi

  # apply patch from the source array (should be a pacman feature)

  local src

  for src in "${source[@]}"; do

    src="${src%%::*}"

    src="${src##*/}"

    [[ $src = *.patch ]] || continue

    msg2 "Applying patch $src..."

    patch -Np1 < "../$src"

  done

  # loading default config