merge from gcc
	* libc/stdio/nano-vfprintf_i.c (_printf_i): Use Newlib approach to
	handle string that might be not nul-terminated.
	* testsuite/newlib.stdio/nulprintf.c: New test.
	* dcrt0.cc (cygwin_atexit): Change preceeding comment to reflect
	API version numbers.
	* external.cc (cygwin_internal): disable setting cxx_malloc on 64 bit.
	Add CW_FIXED_ATEXIT case.
	* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
	* include/sys/cygwin.h (cygwin_getinfo_types): Add CW_FIXED_ATEXIT.
	* lib/atexit.c (atexit): Test running Cygwin version by checking
	return value of cygwin_internal (CW_FIXED_ATEXIT).
Merge branch 'Cygwin' into develop