Preliminary fix for

Bug #30759  	mysql_install_db fails to set $extra_bindir properly in all cases.


scripts/mysql_install_db.sh:
  Preliminary fix for
     Bug #30759  	mysql_install_db fails to set $extra_bindir properly in all cases.
  
  Provided by Daniel for the 5.1.22-rc build, to be superseded by a better patch when that is available.

scripts/mysql_install_db.sh

@@ -231,6 +231,7 @@ then
   pkgdatadir="@pkgdatadir@"
 else
   bindir="$basedir/bin"
+  extra_bindir="$bindir"
   # We set up bootstrap-specific paths later, so skip this for --windows
   if test "$windows" -eq 0
   then