Add _POSIX namespace SYSCONF macros to posix-conf-vars.list

This fixes the remaining -Wundef warnings.  Tested on x86_64.

	* posix/posix-conf-vars.list: Add _POSIX sysconf namespace.
	* sysdeps/posix/sysconf.c: Include posix-conf-vars.h.
	(__sysconf): Use CONF_IS_* macros.

ChangeLog

@@ -1,5 +1,9 @@
 2014-12-29  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
+	* posix/posix-conf-vars.list: Add _POSIX sysconf namespace.
+	* sysdeps/posix/sysconf.c: Include posix-conf-vars.h.
+	(__sysconf): Use CONF_IS_* macros.
+
 	* posix/Makefile (before-compile): Add posix-conf-vars-def.h.
 	($(objpfx)posix-conf-vars-def.h): New target.
 	* posix/posix-conf-vars.list: New file.

posix/posix-conf-vars.list

@@ -14,6 +14,96 @@ SPEC POSIX {
   V7_LPBIG_OFFBIG
 }
 
+SYSCONF POSIX {
+  ADVISORY_INFO
+  ARG_MAX
+  ASYNCHRONOUS_IO
+  BARRIERS
+  BASE
+  CHILD_MAX
+  C_LANG_SUPPORT
+  C_LANG_SUPPORT_R
+  CLOCK_SELECTION
+  CPUTIME
+  DEVICE_IO
+  DEVICE_SPECIFIC
+  DEVICE_SPECIFIC_R
+  FD_MGMT
+  FIFO
+  FILE_ATTRIBUTES
+  FILE_LOCKING
+  FILE_SYSTEM
+  FSYNC
+  JOB_CONTROL
+  MAPPED_FILES
+  MEMLOCK
+  MEMLOCK_RANGE
+  MEMORY_PROTECTION
+  MESSAGE_PASSING
+  MONOTONIC_CLOCK
+  MULTI_PROCESS
+  NETWORKING
+  NGROUPS_MAX
+  OPEN_MAX
+  PII
+  PII_INTERNET
+  PII_INTERNET_DGRAM
+  PII_INTERNET_STREAM
+  PII_OSI
+  PII_OSI_CLTS
+  PII_OSI_COTS
+  PII_OSI_M
+  PII_SOCKET
+  PII_XTI
+  PIPE
+  POLL
+  PRIORITIZED_IO
+  PRIORITY_SCHEDULING
+  READER_WRITER_LOCKS
+  REALTIME_SIGNALS
+  REGEXP
+  SAVED_IDS
+  SELECT
+  SEMAPHORES
+  SHARED_MEMORY_OBJECTS
+  SHELL
+  SIGNALS
+  SINGLE_PROCESS
+  SPAWN
+  SPIN_LOCKS
+  SPORADIC_SERVER
+  SSIZE_MAX
+  STREAM_MAX
+  SYNCHRONIZED_IO
+  SYSTEM_DATABASE
+  SYSTEM_DATABASE_R
+  THREAD_ATTR_STACKADDR
+  THREAD_ATTR_STACKSIZE
+  THREAD_CPUTIME
+  THREAD_PRIO_INHERIT
+  THREAD_PRIO_PROTECT
+  THREAD_PRIORITY_SCHEDULING
+  THREAD_PROCESS_SHARED
+  THREADS
+  THREAD_SAFE_FUNCTIONS
+  THREAD_SPORADIC_SERVER
+  TIMEOUTS
+  TIMERS
+  TRACE
+  TRACE_EVENT_FILTER
+  TRACE_INHERIT
+  TRACE_LOG
+  TYPED_MEMORY_OBJECTS
+  TZNAME_MAX
+  USER_GROUPS
+  USER_GROUPS_R
+  VERSION
+# Additional variables not in getconf.
+  THREAD_DESTRUCTOR_ITERATIONS
+  IPV6
+  RAW_SOCKETS
+}
+
 SPEC XBS5 {
   ILP32_OFF32
   ILP32_OFFBIG