less: update to 643.

[Bnyro]

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture, x86_64-glibc

[Bnyro]

Less seems to use a different test suite using perl now, the error messages are not that helpful:

=> less-643_1: running do_check ...
if [ -x less ] && ./less -V | grep -q LESSTEST; then :; else make clean; make LESSTEST=1; fi
objdir=$(pwd); rflags=""; if [ -z "" ]; then rflags=-e; fi; cd ./lesstest && make && ./runtest $rflags -l "$objdir/less" lt
FAIL: utf8-2.txt (20 steps)
FAIL: chinese1 (29 steps)
if [ -x less ] && ./less -V | grep -q LESSTEST; then :; else make clean; make LESSTEST=1; fi
objdir=$(pwd); rflags=""; if [ -z "" ]; then rflags=-e; fi; cd ./lesstest && make && ./runtest $rflags -l "$objdir/less" lt
make[1]: Entering directory '/builddir/less-643/lesstest'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/builddir/less-643/lesstest'
DIFF utf8-2.txt on cmd #20 (. a)
FAIL: utf8-2.txt (20 steps)
ERR  status 256 from /builddir/less-643/lesstest/lesstest  -e -s '/builddir/less-643/lesstest/lt_screen' -t '/builddir/less-643/lesstest/lt/utf8-2.txt.lt' '/builddir/less-643/less'
DIFF chinese1 on cmd #29 (. a)
FAIL: chinese1 (29 steps)
ERR  status 256 from /builddir/less-643/lesstest/lesstest  -e -s '/builddir/less-643/lesstest/lt_screen' -t '/builddir/less-643/lesstest/lt/chinese1.lt' '/builddir/less-643/less'
RAN  13 tests with 2 errors
make: *** [Makefile:106: check] Error 1
=> ERROR: less-643_1: do_check: '${make_check_pre} ${make_cmd} ${makejobs} ${make_check_args} ${make_check_target}' exited with 2
=> ERROR:   in do_check() at common/build-style/gnu-configure.sh:33