linux-libre-tools: update to 5.13.8
The perf-fix-types.patch has been removed becuase it is already
present in the 5.13.8 kernel upstream with the following commit:
20befbb1080307e70c7893ef9840d32e3ef8ac45 (perf tools: Use %zd
for size_t printf formats on 32-bit).
I updated to 5.13.8 as the linux-libre PKGBUILD aso has that
version.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>