[tracker] thunderbird: Fix --with-thunderbird-plugin-dir configure argument

[Adrien Bustany <abustany src gnome org>]

commit 8fcfa2f0108b3031cd43373f57a6e3b76c4a78af
Author: Adrien Bustany <abustany gnome org>
Date:   Thu Jul 28 21:42:51 2011 +0300

    thunderbird: Fix --with-thunderbird-plugin-dir configure argument
    
    The configure argument would not work and cause the configure script to abort
    when used due to a typo.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f48c67f..5d1e910 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1224,7 +1224,7 @@ if test "x$have_tracker_miner_thunderbird" = "xyes"; then
       # This is a symlinked to $prefix/share/xul-ext
       tracker_miner_thunderbird_install_dir="${prefix}/lib/thunderbird-5.0/extensions"
    else
-      tracker_miner_thunderbird_install_dir="$with_tracker_miner_thunderbird_install_dir"
+      tracker_miner_thunderbird_install_dir="$with_thunderbird_plugin_dir"
    fi
 
    if test -z $tracker_miner_thunderbird_install_dir; then