garray: Add g_ptr_array_new_take() to take a C array without copies

GPtrArray is a nice interface to handle pointer arrays, however if a classic
array needs to be converted into a GPtrArray is currently needed to manually
go through all its elements and do new allocations that could be avoided.

So add g_ptr_array_new_take() which steals the data from an array of
pointers and allows to manage it using the GPtrArray API.

docs/reference/glib/glib-sections.txt.in

@@ -2715,6 +2715,7 @@ g_ptr_array_new_with_free_func
 g_ptr_array_copy
 g_ptr_array_new_full
 g_ptr_array_new_null_terminated
+g_ptr_array_new_take
 g_ptr_array_set_free_func
 g_ptr_array_is_null_terminated
 g_ptr_array_ref