pkg/60041: Package spdlog-1.17.0 fails to build

["nico@rintene.trade via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60041
>Category:       pkg
>Synopsis:       Package spdlog-1.17.0 fails to build
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 26 11:25:00 +0000 2026
>Originator:     nico
>Release:        pkgsrc-2025Q4
>Organization:
rintene.trade
>Environment:
SunOS briareus 5.11 joyent_20251113T010957Z i86pc i386 i86pc
>Description:
The following error occures on build: 
/home/pbulk/build/devel/spdlog/work/spdlog-1.17.0/include/spdlog/details/os-inl.h:266:32: error: 'const struct std::tm' has no member named 'tm_gmtoff'
  266 |     return static_cast<int>(tm.tm_gmtoff / 60);
      |                                ^~~~~~~~~
>How-To-Repeat:

>Fix:
patch-os-intl.h

NetBSD$

--- include/spdlog/details/os-inl.h.orig        2026-01-04 16:06:01.000000000 +0000
+++ include/spdlog/details/os-inl.h
@@ -260,6 +260,16 @@ SPDLOG_INLINE int utc_minutes_offset(con
     auto offset_seconds = utc_time_t - local_time_t;
     return static_cast<int>(offset_seconds / 60);
 }
+#elif defined(__sun)
+SPDLOG_INLINE int utc_minutes_offset(const std::tm &tm) {
+    tzset();
+    int offset = -static_cast<int>(timezone);
+
+    if (tm.tm_isdst > 0) {
+        offset += 3600;
+    }
+    return offset / 60;
+}
 #else
 // On unix simply use tm_gmtoff
 SPDLOG_INLINE int utc_minutes_offset(const std::tm &tm) {