obex: Fix warnings cause by using of deprecated APIs

obex: Fix warnings cause by using of deprecated APIs

obexd/src/main.c: In function 'main':
obexd/src/main.c:237:13: warning: Deprecated pre-processor symbol
  237 |  if (g_thread_supported() == FALSE)
      |             ^~~~~~~~~~~~~~~~~~~~~~~
obexd/src/main.c:238:3: warning: 'g_thread_init' is deprecated
[-Wdeprecated-declarations]
  238 |   g_thread_init(NULL);
      |   ^~~~~~~~~~~~~
In file included from /usr/include/glib-2.0/glib.h:111,
                 from obexd/src/main.c:31:
/usr/include/glib-2.0/glib/deprecated/gthread.h:261:10: note: declared here
  261 | void     g_thread_init                   (gpointer vtable);
      |          ^~~~~~~~~~~~~

Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>