Work around old /usr/bin/man problem

Actually man 1.* does support local mode, we just have to pass pathname
(with slash), which can be easily worked around by using tempfile.

src/bin/sfdoc

@@ -161,11 +161,11 @@ main() {
             ;;
         man)
             which pod2man &>/dev/null \
-             || die "pod2man is missing cannot use man page mode"
-            man --version |& grep -qF 'man 2.' \
-             || die "unknown \`man\` (only 2.x is supported): $(man --version 2>&1)"
-            sfdoc__export manpage "${RealModuleName:-$module}" "$mpath" "$encoding" \
-              | man -l -
+             || die "pod2man is missing; cannot use man page mode"
+            manfile=$(mktemp -t "sfdoc.manfile.XXXXXXXX")
+            sfdoc__export manpage "${RealModuleName:-$module}" "$mpath" "$encoding" >"$manfile"
+            man "$manfile"
+            rm "$manfile"
             ;;
         src)
             local lesspipe