conformtest: correct set of standards for which some headers are tested.

Reviewing the sets of headers for which conformtest has expectations
for various standards showed up cases where headers had expectations
for standards not including those headers, or were missing
expectations for a standard that did include the header.  This patch
fixes easy cases of this (largely disabling tests for standards for
which they are inapplicable).  Tested x86_64.

	* conform/data/aio.h-data [XPG3 || XPG4]: Disable whole file.
	* conform/data/arpa/inet.h-data [XPG3]: Likewise.
	* conform/data/dlfcn.h-data [XPG3 || XPG4]: Likewise.
	* conform/data/fmtmsg.h-data [XPG3]: Likewise.
	* conform/data/libgen.h-data [XPG3]: Likewise.
	* conform/data/mqueue.h-data [XPG3 || XPG4]: Likewise.
	* conform/data/ndbm.h-data [XPG3]: Likewise.
	* conform/data/net/if.h-data [XPG3 || XPG4 || UNIX98]: Likewise.
	* conform/data/netdb.h-data [XPG3]: Likewise.
	* conform/data/netinet/in.h-data [XPG3]: Likewise.
	* conform/data/poll.h-data [XPG3]: Likewise.
	* conform/data/spawn.h-data [XPG3 || XPG4 || UNIX98]: Likewise.
	* conform/data/strings.h-data [XPG3]: Likewise.
	* conform/data/stropts.h-data [XPG3]: Likewise.
	* conform/data/sys/mman.h-data [XPG3]: Likewise.
	* conform/data/sys/resource.h-data [XPG3]: Likewise.
	* conform/data/sys/select.h-data [XPG3 || XPG4 || UNIX98]:
	Likewise.
	* conform/data/sys/statvfs.h-data [XPG3]: Likewise.
	* conform/data/sys/time.h-data [XPG3]: Likewise.
	* conform/data/sys/timeb.h-data [XPG3]: Likewise.
	* conform/data/sys/uio.h-data [XPG3]: Likewise.
	* conform/data/sys/un.h-data [XPG3]: Likewise.
	* conform/data/syslog.h-data [XPG3]: Likewise.
	* conform/data/ucontext.h-data [XPG3]: Likewise.
	* conform/data/utmpx.h-data [XPG3]: Likewise.
	* conform/data/varargs.h-data [UNIX98]: Enable file.
conformtest: correct set of standards for which more headers are tested.

Continuing the corrections to which headers conformtest tests for
which standards, this patch corrects conformtest mistakes regarding
which headers to test for the remaining standards (XOPEN2K POSIX2008
XOPEN2K8).  Tested x86_64.

2014-03-05  Joseph Myers  <joseph@codesourcery.com>

	* conform/data/netinet/tcp.h-data [POSIX2008 || XOPEN2K8]: Enable
	whole file.
	* conform/data/sys/timeb.h-data [POSIX2008 || XOPEN2K8]: Disable
	whole file.
	* conform/data/sys/uio.h-data [POSIX2008]: Likewise.
	* conform/data/ucontext.h-data [POSIX2008 || XOPEN2K8]: Likewise.