* xfns.c (Fx_open_connection): Don't trust HAVE_XRMSETDATABASE;

* xfns.c (Fx_open_connection): Don't trust HAVE_XRMSETDATABASE;
	use XrmSetDatabase only when HAVE_X11R5 is defined.

	* xfns.c (Vx_resource_name): Renamed from Vxrdb_name, and made a
	lisp-visible variable, so lisp/term/x-win.el can set it.  Doc it
	for "internal use only"; no need for NEWS entry.
	(validate_x_resource_name): New function.
	(Fx_get_resource): Doc fix.  References to Vxrdb_name renamed.  Call
	validate_x_resource_name.
	(x_window): References to Vxrdb_name renamed.  Call
	validate_x_resource_name.
	(Fx_open_connection): References to Vxrdb_name renamed.  Instead
	of setting and validating its value here, just call
	validate_x_resource_name.
	(syms_of_xfns): Add DEFVAR_LISP for Vx_resource_name.

	* xfns.c (x_set_frame_parameters): Don't set the frame's size and
	position unless those parameters are actually specified in ALIST.

	* xrdb.c: Implement search for app-defaults directory and
	localized default databases, along with some other functionality
	provided by Xt.
	#include <stdio.h>, since we call sprintf.
	[emacs] (malloc, realloc, free): #define these to xmalloc,
	xrealloc, and xfree.
	(x_get_string_resource, file_p): Add forward declarations for
	these.
	(x_customization_string): New variable.
	(x_get_customization_string): New function.
	(gethomedir): Return malloc'ed space of the right size, instead of
	writing into a fixed-size buffer; this means that our callers do
	not impose an arbitrary limit on file name length.
	(magic_file_p): Rewrite of decode_magic; actually do the
	substitutions, instead of expanding all %-escapes to "".  Support
	the customization string.  Return 0 or the expanded file name,
	instead of just zero or one.  Allocate the space for the expanded
	file name ourselves, instead of writing into a fixed-size buffer
	passed to us; this removes an arbitrary limit.
	(search_magic_path): Rewrite of magic_searchpath_decoder.  Return
	0 or the expanded file name, instead of just zero or one.
	Allocate the space for the expanded file name ourselves, instead
	of writing into a fixed-size buffer passed to us; this means that
	our callers do not impose an arbitrary limit on file name length.
	(get_system_app): Changed to work with search_magic_path.
	(get_user_app): Rewritten to work with search_magic_path, and not
	to assume that the values of XAPPLRESDIR is a single directory.
	(get_user_db): Properly use the new version of gethomedir.
	(get_environ_db): Remove arbitrary limit on length of host name.
	(x_load_resources): Take a new argument, myname.  Call get_user_db
	early to obtain the customization string.
	Changes to stand-alone testing code.
	* xfns.c (Fx_open_connection): Set Vxrdb_name early, and pass it
	to x_load_resources.