[libpeas] Fix incorrect configure help string for the gtk2-test-build option

[Steve Frécinaux <sfre src gnome org>]

commit 4d674ea21b843c66dceeeda25feafed73dc2a9ac
Author: Simon Wenner <simon wenner ch>
Date:   Sun Jun 20 14:29:42 2010 +0200

    Fix incorrect configure help string for the gtk2-test-build option
    
    https://bugzilla.gnome.org/show_bug.cgi?id=622183

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f102ac9..020022a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -101,7 +101,7 @@ PKG_CHECK_MODULES(PEAS, [
 dnl We currently allow building libpeas with Gtk+ 2.0 for testing purposes and
 dnl technology preview. but do *not* distribute such a version!
 AC_ARG_ENABLE(gtk2-test-build,
-	      AS_HELP_STRING([--gtk2-test-build],[Link against gtk+ 2.0, for testing purpose]),
+	      AS_HELP_STRING([--enable-gtk2-test-build],[Link against gtk+ 2.0, for testing purpose]),
 	      [use_gtk2=$enableval],
 	      [use_gtk2=no])