Just some cleanups noticed while working on PR 10760

Just some cleanups noticed while working on PR 10760

	* dbxread.c (dbx_symfile_read): Call free_pending_blocks rather
	than poking global variable (which is now static).
	* hpread.c (hpread_build_psymtabs): Ditto.
	* os9kread.c (os9k_symfile_read): Ditto.
	* xcoffread.c (xcoff_initial_scan): Ditto.

	* buildsym.h (free_pending_blocks): Declare here.
	(pending_blocks): Remove declaration of global symbol.
	(free_pendings): Remove declaration of global symbol.
	(make_blockvector): Declare here.
	(record_pending_block): Declare here.

	* dstread.c (make_blockvector): Remove static copy that was old
	clone of version in buildsym.c.
	(process_dst_block): Call record_pending_block rather than doing
	it by hand.
	(read_dst_symtab): Ditto.

	* buildsym.c (make_blockvector): Make global rather than static,
	(record_pending_block): New function, code moved from finish_block.
	(finish_block): Use record_pending_block.
	(free_pending_blocks): New function.
	(really_free_pendings): Call free_pending_blocks.
	(pending_blocks): Make static instead of global.
	(free_pendings): Make static instead of global.