[gstreamermm] Deprecate plugins API

[Marcin Kolny <mkolny src gnome org>]

commit d41007ffba299480859e77e9d88f742de1e2949f
Author: Marcin Kolny <marcin kolny gmail com>
Date:   Wed Aug 31 23:32:57 2016 +0200

    Deprecate plugins API
    
    The API will be replaced by the standalone application which
    allow to generate API for the specific plugins
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755395

 .../extra_defs_gen/generate_plugin_gmmproc_file.cc |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/tools/extra_defs_gen/generate_plugin_gmmproc_file.cc 
b/tools/extra_defs_gen/generate_plugin_gmmproc_file.cc
index 2a490dd..1255d4f 100644
--- a/tools/extra_defs_gen/generate_plugin_gmmproc_file.cc
+++ b/tools/extra_defs_gen/generate_plugin_gmmproc_file.cc
@@ -657,6 +657,7 @@ static void generate_hg_file(const std::string& includeMacroCalls,
     "otherwise there will\n * be errors and possibly a crash." << std::endl;
   std::cout << " *" << std::endl;
   std::cout << " * @ingroup " << nmspace << "Plugins" << std::endl;
+  std::cout << " * @deprecated Plugins API is deprecated, and should not be used in a new code." << 
std::endl;
   std::cout << " */" << std::endl;
   std::cout << "class " << cppTypeName << std::endl;
   std::cout << ": public " << parentNameSpace << "::" << cppParentTypeName;