Adjust GC_log_printf format specifiers (regarding signed/unsigned long)

Adjust GC_log_printf format specifiers (regarding signed/unsigned long)

* alloc.c (GC_maybe_gc, GC_expand_hp_inner): Change printf "%ld"
format specifier to "%lu" one according to printed value.
* backgraph.c (GC_print_back_graph_stats): Likewise.
* blacklst.c (GC_default_print_heap_obj_proc,
GC_promote_black_lists): Likewise.
* gcj_mlc.c (GC_debug_gcj_malloc): Likewise.
* mark_rts.c (GC_print_static_roots): Likewise.
* alloc.c (GC_stopped_mark): Correct logged GC number.
* dbg_mlc.c (GC_print_backtrace): Cast printed value to proper type.
* mark.c (GC_mark_from): Likewise.
* dbg_mlc.c (GC_debug_malloc, GC_debug_malloc_ignore_off_page,
GC_debug_malloc_atomic_ignore_off_page, GC_debug_malloc_stubborn,
GC_debug_malloc_atomic, GC_debug_malloc_uncollectable): Change printf
"%ld" format specifier for line number to "%d" one.
* malloc.c (GC_free): Improve logged message (if LOG_ALLOCS).
* thread_local_alloc.c (GC_malloc): Likewise.
* os_dep.c (GC_dirty_init): Improve logged message (for VERBOSE level).