garray.c can use memset in stead of looping for g_ptr_array_set_size
Submitted by Philip Van Hoof
Link to original bug (#422939)
Description
GPtrArray's g_ptr_array_set_size can actually use memset as glib for all its platforms does use bitwize zeros for NULL. If not this should be detectable using a preprocessor thingy.
I'll attach a proposal