Add "volatile" keyword to "struct gdb_exception" declaration

While doing something else, I found that those 2 places were incorrectly
declaring a "struct gdb_exception" without using the "volatile" keyword.
This commit fixes that.

2014-01-17  Sergio Durigan Junior  <sergiodj@redhat.com>

	* breakpoint.c (insert_bp_location): Add "volatile" keyword to "struct
	gdb_exception" declaration.
	* remote.c (getpkt_or_notif_sane): Likewise.
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