build: Add a Valgrind suppressions file

This can be used with --suppressions=janus.supp with Valgrind to
suppress common GLib initialisation leaks, plus a couple of
Janus-specific leaks.

janus.supp

@@ -0,0 +1,242 @@
+{
+	gnutls-init-calloc
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:gtls_gnutls_init
+}
+
+{
+	gnutls-init-realloc
+	Memcheck:Leak
+	fun:realloc
+	...
+	fun:gtls_gnutls_init
+}
+
+{
+	g-tls-backend-gnutls-init
+	Memcheck:Leak
+	fun:g_once_impl
+	fun:g_tls_backend_gnutls_init
+}
+
+{
+	p11-tokens-init
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:create_tokens_inlock
+	fun:initialize_module_inlock_reentrant
+}
+
+{
+	gobject-init-malloc
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:gobject_init_ctor
+}
+
+{
+	gobject-init-realloc
+	Memcheck:Leak
+	fun:realloc
+	...
+	fun:gobject_init_ctor
+}
+
+{
+	gobject-init-calloc
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:gobject_init_ctor
+}
+
+{
+	g-type-register-dynamic
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_type_register_dynamic
+}
+
+{
+	g-type-register-static
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_type_register_static
+}
+
+{
+	g-type-register-static-realloc
+	Memcheck:Leak
+	fun:realloc
+	...
+	fun:g_type_register_static
+}
+
+{
+	g-type-register-static-calloc
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:g_type_register_static
+}
+
+{
+	g-type-add-interface-dynamic
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_type_add_interface_dynamic
+}
+
+{
+	g-type-add-interface-static
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_type_add_interface_static
+}
+
+{
+	g-test-rand-init
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:g_rand_new_with_seed_array
+	fun:test_run_seed
+	...
+	fun:g_test_run
+}
+
+{
+	g-test-rand-init2
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:g_rand_new_with_seed_array
+	...
+	fun:get_global_random
+	...
+	fun:g_test_init
+}
+
+{
+	g-quark-table-new
+	Memcheck:Leak
+	fun:g_hash_table_new
+	...
+	fun:quark_new
+}
+
+{
+	g-quark-table-resize
+	Memcheck:Leak
+	fun:g_hash_table_resize
+	...
+	fun:quark_new
+}
+
+{
+	g-type-interface-init
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:type_iface_vtable_base_init_Wm
+}
+
+{
+	g-type-class-init
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:type_class_init_Wm
+}
+
+{
+	g-io-module-default-singleton-malloc
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_type_create_instance
+	...
+	fun:_g_io_module_get_default
+}
+
+{
+	g-io-module-default-singleton-module
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:g_module_open
+	...
+	fun:_g_io_module_get_default
+}
+
+{
+	g-get-language-names
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_get_language_names
+}
+
+{
+	g-static-mutex
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:g_static_mutex_get_mutex_impl
+}
+
+{
+	g-system-thread-init
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:g_system_thread_new
+}
+
+{
+	g-io-module-default-proxy-resolver-gnome
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:g_proxy_resolver_gnome_init
+	...
+	fun:_g_io_module_get_default
+}
+
+{
+	gnutls-pkcs11-init
+	Memcheck:Leak
+	fun:calloc
+	...
+	fun:p11_kit_initialize_registered
+	fun:gnutls_pkcs11_init
+}
+
+# Actually a leak, but dlclose() is normally commented out so that debug
+# symbols are available for the plugins.
+{
+	janus-plugins
+	Memcheck:Leak
+	fun:malloc
+	fun:dl_open_worker
+	...
+	fun:main
+}
+
+# Probably a leak, but hard to trace. FIXME.
+{
+	janus-sdp
+	Memcheck:Leak
+	fun:calloc
+	fun:su_home_new
+	fun:janus_sdp_init
+	fun:main
+}