NEWS: Mention x86_64/Cygwin as new native configuration too.

x86_64/Cygwin is only mentioned as a new target, but we gained support
for building a native x86_64/Cygwin debugger too.

gdb/
2013-04-03  Pedro Alves  <palves@redhat.com>

	* NEWS: Mention x86_64/Cygwin as new native configuration.
gdb/
	* NEWS (Changes in GDB 7.6): Update the data-disassemble for "fullname".
	New entry about "fullname" presence.
	* contrib/cc-with-tweaks.sh: Check exit code of dwp.
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