Remove REMOTE_EXAMPLES from gdb/Makefile.in

Remove REMOTE_EXAMPLES from gdb/Makefile.in

I happen to see REMOTE_EXAMPLES isn't used anywhere, so this patch
removes it.

REMOTE_EXAMPLES was added in the following commit in 1991,

commit 86bbb439c8fa01fd55d6cbce102483a471ffd0c4
Author: John Gilmore <gnu@cygnus>
Date:   Fri May 3 19:57:13 1991 +0000

    There should be a Makefile in the cvs main directory, configured
    for "./config.gdb none", so that things like "make tags" and "make tar"
    will work.

and it was used like:

TARFILES = ${TAGFILES_MAINDIR} ${OTHERS} ${REMOTE_EXAMPLES}

However TARFILES was removed by the change latter in 1994,

Tue Aug 16 15:24:03 1994  Jim Kingdon  (kingdon@lioth.cygnus.com)

	* symtab.c (decode_line_1): If funfirstline and we get a
	non-LOC_BLOCK symbol (e.g. variable or type), then error().

	* Makefile.in (TARFILES, NONSRC, SFILES_STAND, SFILES_KGDB):
	Remove; unused.

Since then, REMOTE_EXAMPLES is not used any more.

gdb:

2015-07-27  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (REMOTE_EXAMPLES): Remove it.