[newlib-cygwin/cygwin-3_3-branch] Cygwin: sysconf: _SC_TZNAME_MAX: return -1 as valid value

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a9fb6a22e3903fe6fa1417a82218f53bd0a2de05

commit a9fb6a22e3903fe6fa1417a82218f53bd0a2de05
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Mar 1 10:14:42 2022 +0100

    Cygwin: sysconf: _SC_TZNAME_MAX: return -1 as valid value
    
    sysconf incorrectly sets errno to EINVAL for _SC_TZNAME_MAX.
    Don't do that.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/sysconf.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/sysconf.cc b/winsup/cygwin/sysconf.cc
index 70cdb0fbd..8240db2e4 100644
--- a/winsup/cygwin/sysconf.cc
+++ b/winsup/cygwin/sysconf.cc
@@ -527,7 +527,7 @@ static struct
   {cons, {c:SEM_VALUE_MAX}},		/*  17, _SC_SEM_VALUE_MAX */
   {cons, {c:SIGQUEUE_MAX}},		/*  18, _SC_SIGQUEUE_MAX */
   {cons, {c:TIMER_MAX}},		/*  19, _SC_TIMER_MAX */
-  {nsup, {c:0}},			/*  20, _SC_TZNAME_MAX */
+  {cons, {c:-1L}},			/*  20, _SC_TZNAME_MAX */
   {cons, {c:_POSIX_ASYNCHRONOUS_IO}},	/*  21, _SC_ASYNCHRONOUS_IO */
   {cons, {c:_POSIX_FSYNC}},		/*  22, _SC_FSYNC */
   {cons, {c:_POSIX_MAPPED_FILES}},	/*  23, _SC_MAPPED_FILES */