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Pull in changes from HEAD
	* cygtls.h: Cleanup x86_64 related comment.
	(_tlsbase): Change return type to PVOID.
	(_tlstop): Ditto.
	(_my_tls): Accommodate above change.
	* dcrt0.cc (child_info_fork::alloc_stack): Revert previous patch, but
	keep cast to PVOID.
	(dll_crt0_1): Ditto.
	* exception.h: Define _exception_list as _EXCEPTION_REGISTRATION_RECORD
	on x86_64.
	(_except_list): Define in terms of NtCurrentTeb() on x86_64.
	* miscfuncs.cc (__import_address): Handle 32 bit absolute addressing
	in IAT on x86_64.
	* include/cygwin/config.h (___getreent): New inline function on
	x86_64.  Define __getreent in terms of ___getreent on x86_64.  Fix
	comment accordingly.
...and pull in changes from HEAD