Fix linknamespace getdate_err handling.
Some linknamespace tests were failing because of references to
getdate_err. References to this symbol should be allowed for XPG4 and
later XSI standards; it was missing from the whitelist of data
symbols. This patch adds it to that list.
Tested for x86_64.
* conform/list-header-symbols.pl (%extra_syms): Add getdate_err
for XPG4, UNIX98, XOPEN2K and XOPEN2K8.
* conform/Makefile (test-xfail-XOPEN2K/pthread.h/linknamespace):
Remove variable.
(test-xfail-XOPEN2K/time.h/linknamespace): Likewise.
(test-xfail-XOPEN2K8/pthread.h/linknamespace): Likewise.
(test-xfail-XOPEN2K8/time.h/linknamespace): Likewise.