target_set_syscall_catchpoint, use gdb::array_view and bool

I noticed that we're passing down a data/size pair to
target_ops::to_set_syscall_catchpoint.  This commit makes use of
gdb::array_view instead.  While at it, use bool where appropriate as
well.

gdb/ChangeLog:

	* break-catch-syscall.c (insert_catch_syscall)
	(remove_catch_syscall): Adjust to pass reference to
	inf_data->syscalls_counts directly via gdb::array_view.
	* fbsd-nat.c (fbsd_set_syscall_catchpoint): Adjust to use bool
	and gdb::array_view.
	* linux-nat.c (linux_child_set_syscall_catchpoint): Likewise.
	* remote.c (remote_set_syscall_catchpoint): Likewise.
	* target-debug.h (target_debug_print_bool): New.
	(define target_debug_print_gdb_array_view_const_int): New.
	* target-delegates.c: Regenerate.
	* target.h (target_ops) <to_set_syscall_catchpoint>: Use
	gdb::array_view and bool.
	(target_set_syscall_catchpoint): Likewise.