gdb: remove `other` parameter in read_core_file_mappings parameter

gdb: remove `other` parameter in read_core_file_mappings parameter

The `void *other` parameter in read_core_file_mappings' loop_cb
parameter is never used, remove it.

gdb/ChangeLog:

	* gdbarch.sh (read_core_file_mappings): Remove `other` parameter
	in `loop_cb` parameter.
	* gdbarch.c: Re-generate.
	* gdbarch.h: Re-generate.
	* arch-utils.c (default_read_core_file_mappings): Remove `other`
	parameter.
	* arch-utils.h (default_read_core_file_mappings): Likewise.
	* corelow.c (core_target::build_file_mappings): Likewise.
	* linux-tdep.c (linux_read_core_file_mappings): Likewise.
	(linux_core_info_proc_mappings): Likewise.

Change-Id: I6f408b4962b61b8a603642a844772b3026625523