Fix man for systems lacking the col command

At least Alpine linux with mandoc does not have the col command,
as it is easy to emulate with sed, fallback onto it when it does
not exist.

rc/tools/man.kak

@@ -38,8 +38,13 @@ define-command -hidden -params ..3 man-impl %{ evaluate-commands %sh{
     colout=$(mktemp "${TMPDIR:-/tmp}"/kak-man.XXXXXX)
     env MANWIDTH=${kak_window_range##* } man "$@" > "$manout" 2> "$manerr"
     retval=$?
-    col -b -x > ${colout} < ${manout}
+    if command -v col >/dev/null; then
+        col -b -x > ${colout} < ${manout}
+    else
+        sed 's/.//g' > ${colout} < ${manout}
+    fi
     rm ${manout}
+
     if [ "${retval}" -eq 0 ]; then
         printf %s\\n "
                 edit -scratch %{*$buffer_name ${*}*}