Fix small spelling mistake in gdb/ChangeLog.
Misplaced parenthesis calculates two too few bytes for string

Factor out strlen to give better code and less likelihood of a repeat
of this problem.

	PR 17766
	* pei-x86_64.c (pex64_bfd_print_pdata_section): Correct string
	length.  Use memcpy rather than strcpy.
Automatic date update in version.in