* cygwin64.din (BASE): Set to 0x180040000.
	(_fe_dfl_env): Remove useless symbol.
	(_fe_nomask_env): Remove useless symbol.
	(exit): Add missing symbol.
	(setmode): Ditto.
	* gendef (longjmp): Convert all displacements to hex for readability.
	Change all movaps instructions to movdqu to accommodate unaligned
	access to 128 bit values.
Enforced checkin
	* regparm.h: New file to define platform dependent regparm attributes.
	Define all of them empty if __CYGMAGIC__ is defined.
	* cygerrno.h: Include regparm.h instead of defining _reg[123] here.
	* winsup.h: Ditto.
	* cygmagic: Define __CYGMAGIC__ to help generate same result on all
	platforms.
	* child_info.h (CURR_CHILD_INFO_MAGIC): Update.
	(class child_info_fork): Drop extraneous semicolon.
Fix ChangeLog entries
	* child_info.h (CURR_CHILD_INFO_MAGIC): Update.
	(class child_info_fork): Drop extraneous semicolon.
	* configure: Regenerate to fix wrong ac_unique_file dependency.
Merge branch 'cygwin64' into msys2-64-dev