Configure: reuse "cached" value of "none" for dir

When value of a directory (i.e. man1dir) is set to "none" because of:
- '-D' option set on cmdline (i.e. -Dman1dir=none) OR
- because value is reused from previous configure run

And when the prefix is different from the previous configure run(*) then
keep the value of "none". predefined/cached value does not contain the
old prefix so there is no harm in keeping it.

(*): due to another bug this also happens when prefix ends with a
     trailing slash

See https://rt.perl.org/Ticket/Display.html?id=134284

diff --git a/dist/U/Prefixit.U b/dist/U/Prefixit.U
index 05b32ab..2c87254 100644 (file)
--- a/dist/U/Prefixit.U
+++ b/dist/U/Prefixit.U
@@ -51,7 +51,7 @@ prefixit='case "$3" in
                none)
                        eval "tp=\"\$$2\"";
                        case "$tp" in
-                       ""|" ") eval "$1=\"\$$2\"";;
+                       ""|" "|none) eval "$1=\"\$$2\"";;
                        *) eval "$1=";;
                        esac;;
                esac;;