gi: Skip allocator of non-boxed structure

These are not usable as they are, and can easily lead to crash
or leaks. This also silence warning from the scanner. If we manage to
make this usable, we can then remove that mark, it will require
to make this type boxed.

libs/gst/base/gstbitreader.c

@@ -37,7 +37,7 @@
  */
 
 /**
- * gst_bit_reader_new:
+ * gst_bit_reader_new: (skip)
  * @data: (array length=size): Data from which the #GstBitReader
  *   should read
  * @size: Size of @data in bytes

libs/gst/base/gstbytereader.c

@@ -42,7 +42,7 @@
  */
 
 /**
- * gst_byte_reader_new:
+ * gst_byte_reader_new: (skip)
  * @data: (in) (transfer none) (array length=size): data from which the
  *     #GstByteReader should read
  * @size: Size of @data in bytes

libs/gst/base/gstbytewriter.c

@@ -39,7 +39,7 @@
  */
 
 /**
- * gst_byte_writer_new:
+ * gst_byte_writer_new: (skip)
  *
  * Creates a new, empty #GstByteWriter instance
  *
@@ -57,7 +57,7 @@ gst_byte_writer_new (void)
 }
 
 /**
- * gst_byte_writer_new_with_size:
+ * gst_byte_writer_new_with_size: (skip)
  * @size: Initial size of data
  * @fixed: If %TRUE the data can't be reallocated
  *
@@ -82,7 +82,7 @@ gst_byte_writer_new_with_size (guint size, gboolean fixed)
 }
 
 /**
- * gst_byte_writer_new_with_data:
+ * gst_byte_writer_new_with_data: (skip)
  * @data: Memory area for writing
  * @size: Size of @data in bytes
  * @initialized: If %TRUE the complete data can be read from the beginning