[evince] build: Disable build of broswer-plugin by default

[Germán Poo-Caamaño <gpoo src gnome org>]

commit d07ae14dabdc72d7bf75a5916932e8183d9974cb
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Mon Sep 3 10:13:47 2018 -0300

    build: Disable build of broswer-plugin by default
    
    Epiphany deprecated NPAPI, and it will not download documents
    for plugins. It does not make sense to have the plugin enabled.
    
    See #968

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 3ecf95ec..05c3542f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -510,7 +510,7 @@ AC_ARG_ENABLE([browser-plugin],
   [AS_HELP_STRING([--disable-browser-plugin],
                   [Disable the Browser Plugin])],
   [],
-  [enable_browser_plugin=yes])
+  [enable_browser_plugin=no])
 
 if test x$enable_browser_plugin = "xyes" ; then
   PKG_CHECK_MODULES([BROWSER_PLUGIN],[gtk+-3.0 >= $GTK_REQUIRED gthread-2.0 gio-2.0 >= $GLIB_REQUIRED])