[presubmit] Enable runtime/threadsafe_fn linter checking.

src/base/platform/platform-freebsd.cc

Index: src/base/platform/platform-freebsd.cc
diff --git a/src/base/platform/platform-freebsd.cc b/src/base/platform/platform-freebsd.cc
index 3b8f3db781796f712552b0b469dcd3532aaca888..b279e0c9268fff97066ee72cfe33a84f6353a923 100644
--- a/src/base/platform/platform-freebsd.cc
+++ b/src/base/platform/platform-freebsd.cc
@@ -39,7 +39,7 @@ namespace base {
 const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
   if (std::isnan(time)) return "";
   time_t tv = static_cast<time_t>(std::floor(time/msPerSecond));
-  struct tm* t = localtime(&tv);
+  struct tm* t = localtime(&tv);  // NOLINT(runtime/threadsafe_fn)
   if (NULL == t) return "";
   return t->tm_zone;
 }
@@ -47,7 +47,7 @@ const char* OS::LocalTimezone(double time, TimezoneCache* cache) {
 
 double OS::LocalTimeOffset(TimezoneCache* cache) {
   time_t tv = time(NULL);
-  struct tm* t = localtime(&tv);
+  struct tm* t = localtime(&tv);  // NOLINT(runtime/threadsafe_fn)
   // tm_gmtoff includes any daylight savings offset, so subtract it.
   return static_cast<double>(t->tm_gmtoff * msPerSecond -
                              (t->tm_isdst > 0 ? 3600 * msPerSecond : 0));