meson: Link to objects instea of static helper library

Otherwise the objects from that static helper library are not included
in the gstreamer-1.0 static library. This was supposed to be fixed in
Meson, but the pull request hasn't been merged yet:
https://github.com/mesonbuild/meson/pull/3939

Closes https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/398

gst/meson.build

@@ -237,6 +237,7 @@ gst_incdirs = [configinc]
 gst_gen_sources = [gstenum_h]
 libgst = library('gstreamer-1.0', gst_sources,
   gstenum_h, gstenum_c, gst_parse_sources, gst_registry_sources,
+  objects : printf_lib.extract_all_objects(),
   version : libversion,
   soversion : soversion,
   darwin_versions : osxversion,
@@ -244,7 +245,6 @@ libgst = library('gstreamer-1.0', gst_sources,
   include_directories : [configinc,
     # HACK, change include paths in .y and .l in final version.
     include_directories('parse')],
-  link_with : printf_lib,
   install : true,
   dependencies : [gobject_dep, gmodule_dep, glib_dep, mathlib, dl_dep] + backtrace_deps
                    + platform_deps,