* include/cygwin/version.h (CYGWIN_VERSION_DLL_MINOR): Bump to 19.
	* libc/include/sys/cdefs.h: Align with latest FreeBSD file header.
	* libc/include/sys/features.h (__GNUC_PREREQ__): Define.
	Adapt to changes in newlib's sys/cdefs.h:
	* include/sys/sysinfo.h (struct sysinfo): Rename __unused member to __f.
	* libc/fts.c (__FBSDID): Drop definition.
	* regex/regexec.c (__unused): Drop definition.
	* include/sys/queue.h: Delete in favor of more complete newlib file.