manual: Add new header and standards annotations.

	This commit completes header and standard annotations for all
	@def*-commands and @vtable @items.

	The header annotations are believed to all be correct, as the
	various definitions/declarations had to found in a header.

	The standards annotations are a best-effort.  They are roughly
	derived from the following strategy:

    	  1) Use the feature test macro if wrapped in a #if.
    	  2) Obvious context, including:
    	   a) top of file says, e.g., "ISO C99 ..."
    	   b) manual annotates other nearby, related entries
    	   c) manual describes section as per a given standard

	The "???" placeholder is used for anything not obvious from a
	cursory survey of the glibc sources.

	The choice of standards nomenclature is not meant to establish
	any sort of convention.

	In the Summary of Library Facilities, this commit adds roughly
	380 new entries, and fixes a few others.

	* manual/argp.texi: Complete header and standards annotations.
	* manual/arith.texi: Likewise.
	* manual/creature.texi: Likewise.
	* manual/filesys.texi: Likewise.
	* manual/ipc.texi: Likewise.
	* manual/lang.texi: Likewise.
	* manual/llio.texi: Likewise.
	* manual/locale.texi: Likewise.
	* manual/math.texi: Likewise.
	* manual/memory.texi: Likewise.
	* manual/message.texi: Likewise.
	* manual/nss.texi: Likewise.
	* manual/pattern.texi: Likewise.
	* manual/platform.texi: Likewise.
	* manual/process.texi: Likewise.
	* manual/resource.texi: Likewise.
	* manual/search.texi: Likewise.
	* manual/signal.texi: Likewise.
	* manual/socket.texi: Likewise.
	* manual/stdio.texi: Likewise.
	* manual/sysinfo.texi: Likewise.
	* manual/syslog.texi: Likewise.
	* manual/terminal.texi: Likewise.
	* manual/time.texi: Likewise.
	* manual/users.texi: Likewise.
---
 manual/argp.texi     |  28 +++++++++
 manual/arith.texi    |  28 +++++++++
 manual/creature.texi |   2 +
 manual/filesys.texi  |  44 ++++++++++++++
 manual/ipc.texi      |  28 +++++++++
 manual/lang.texi     |  20 +++++++
 manual/llio.texi     |  82 +++++++++++++++++++++++++
 manual/locale.texi   | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++
 manual/math.texi     |  26 ++++++++
 manual/memory.texi   |  25 ++++++++
 manual/message.texi  |   4 ++
 manual/nss.texi      |   8 +++
 manual/pattern.texi  |  36 +++++++++++
 manual/platform.texi |  20 +++++++
 manual/process.texi  |   8 +++
 manual/resource.texi |  27 +++++++++
 manual/search.texi   |  12 ++++
 manual/signal.texi   |  12 ++++
 manual/socket.texi   |   3 +
 manual/startup.texi  |   2 +
 manual/stdio.texi    |  52 ++++++++++++++++
 manual/string.texi   |   2 +
 manual/sysinfo.texi  |  50 ++++++++++++++++
 manual/syslog.texi   |  64 ++++++++++++++++++++
 manual/terminal.texi |  14 +++++
 manual/time.texi     |   6 ++
 manual/users.texi    |   8 +++
 27 files changed, 777 insertions(+)