valgrind: Add more suppressions to glib.supp

These were spotted by running the entire test suite under valgrind,
thanks to the magic of Meson: see the build rules in valgrind-x86_64 in
.gitlab-ci.yml.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

glib.supp

@@ -51,6 +51,16 @@
 	fun:initialize_module_inlock_reentrant
 }
 
+# One-time allocation from libc for getpwnam() results
+{
+	g-local-vfs-getpwnam
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:getpwnam
+	fun:g_local_vfs_parse_name
+}
+
 {
 	gobject-init-malloc
 	Memcheck:Leak
@@ -232,6 +242,18 @@
 	fun:_g_io_module_get_default
 }
 
+# One-time getaddrinfo() configuration loading
+{
+	g-threaded-resolver-getaddrinfo-config
+	Memcheck:Leak
+	fun:malloc
+	...
+	fun:__resolv_conf_allocate
+	...
+	fun:getaddrinfo
+	fun:do_lookup_by_name
+}
+
 # memcheck checks that the third argument to ioctl() is a valid pointer, but
 # some ioctls use that argument as an integer
 {