[librsvg] Bug 682506: Correct the have_gtk_2 test

[John Ralls <jralls src gnome org>]

commit 60cca884e596fcb0afb50d8b6144f81467534c0a
Author: John Ralls <jralls ceridwen us>
Date:   Wed Aug 22 14:29:50 2012 -0700

    Bug 682506: Correct the have_gtk_2 test

 configure.in |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/configure.in b/configure.in
index 6c89681..5a94fae 100644
--- a/configure.in
+++ b/configure.in
@@ -142,8 +142,7 @@ AM_CONDITIONAL([HAVE_GTK_3],[test "$have_gtk_3" = "yes"])
 # ===========================================================================
 # GTK theme engine
 # ===========================================================================
-
-if test "$have_gtk_2"; then
+if test "$have_gtk_2" = "yes"; then
   AC_MSG_CHECKING([whether to build the GTK+ theme engine])
   AC_ARG_ENABLE([gtk-theme],
     [AS_HELP_STRING([--disable-gtk-theme],[Disable a RSVG based GTK+ theme engine (default=yes)])],