[gdk-pixbuf] Fix unportable test construct in configure

[David King <davidk src gnome org>]

commit bfb722aa8e19f2d404c54c2644b4a06af8fa37c6
Author: Thomas Klausner <wiz danbala tuwien ac at>
Date:   Sat Mar 5 09:18:42 2011 +0100

    Fix unportable test construct in configure
    
    Fixes bug 640407.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b17ba84..161908d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1011,7 +1011,7 @@ AC_ARG_ENABLE(Bsymbolic,
                            enable_Bsymbolic=no)
                LDFLAGS="${SAVED_LDFLAGS}"])
 
-if test "x${enable_Bsymbolic}" == "xyes"; then
+if test "x${enable_Bsymbolic}" = "xyes"; then
   GDK_PIXBUF_LINK_FLAGS=-Wl,-Bsymbolic-functions
 fi