gcconfig.h (GC_data_start): declare when needed.

2003-03-04  Hans Boehm <Hans.Boehm@hp.com>
	* include/private/gcconfig.h (GC_data_start): declare when needed.
	* include/private/gc_priv.h: Include gcconfig.h after ptr_t
	declaration.
	* dyn_load.c (GC_register_dynamic_libraries_dl_iterate_phdr,
	GC_register_dynlib_callback): Register main data for static
	executable if dl_iterate_phdr() didn't.
	* misc.c (GC_init_inner): Call GC_init_linux_data_start() even
	if we don't expect to register main static data.

From-SVN: r63809