bootstrap: fix description of func_sort_ver to match recent sort change

gl/build-aux/funclib.sh: Update comment to match reality.
bootstrap: Regenerate.

Signed-off-by: Peter Rosin <peda@lysator.liu.se>
libtool: actually strip -Wl when relinking with $LD

Fixes the regression from commit v2.4.2.444 which is causing a
testsuite failure in duplicate_conv.at (seen on Cygwin).

* build-aux/ltmain.in (func_mode_link): $reload_cmds typically
starts with "$LD$reload_flag ..." when $LD is used to relink.
Make the case expression match that when checking if $LD is in
fact used to relink.

Signed-off-by: Peter Rosin <peda@lysator.liu.se>
tests: sprinkle -no-undefined when linking libraries

* tests/duplicate_conv.at, tests/f77demo.at, tests/fcdemo.at: Here.

Signed-off-by: Peter Rosin <peda@lysator.liu.se>