[RTEMS Project] #3920: Update POSIX compliance guide

[RTEMS trac]

#3920: Update POSIX compliance guide
---------------------------+---------------------------
  Reporter:  eshan dhawan  |      Owner:  Joel Sherrill
      Type:  defect        |     Status:  assigned
  Priority:  low           |  Milestone:  Indefinite
 Component:  doc           |    Version:
  Severity:  minor         |   Keywords:
Blocked By:                |   Blocking:
---------------------------+---------------------------
 Some headers and methods have been implemented in Newlib/RTEMS/RTEMS
 libbsd but there supported status still needs to be updated in the
 compliance guide

 wcsncasecmp_l () of wchar.h has implementation in libc/string
 pselect() of select.h has been implemented in RTEMS libbsd

 There might be other methods that might have been missed out can be
 reported here.

 Compliance guide: https://docs.rtems.org/branches/master/posix-
 compliance/index.html

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Ticket URL: <http://devel.rtems.org/ticket/3920>
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