[libgda/LIBGDA_5.2] Fix build with UI extension

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 7e14faf48d5419aa827e191101076e443b50b0e1
Author: Daniel Espinosa <esodan gmail com>
Date:   Tue Apr 23 13:33:41 2019 -0500

    Fix build with UI extension

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9caad2505..2262a66a2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -189,7 +189,7 @@ AC_ARG_WITH(ui,
                with_ui=auto
        ])
 
-if test "$with_ui" = xauto -o "$with_ui" = xyes
+if test x"$with_ui" = xauto -o x"$with_ui" = xyes
 then
        GTK_MODULES="gtk+-3.0 >= 3.0.0"
        PKG_CHECK_MODULES(GTK, $GTK_MODULES, [
@@ -1069,4 +1069,4 @@ if test x"$br_cv_binreloc" != "xyes" -a x"$platform_win32" != "xyes"
 then
        echo "   Binreloc support is disabled: Libgda will not be relocatable. To enable binreloc support 
re-run with --enable-binreloc (see http://autopackage.org/docs/binreloc for more information)"
 fi
-echo ""
\ No newline at end of file
+echo ""