FindThreads: Fix pthreads detection with -Wmissing-prototypes
If the project builds with `-Wmissing-prototypes` to catch unnecessarily
exported symbols, `CheckForPthreads.c` will fail to build. Fix this by
marking `start_routine` as static.
Fixes: #25886
diff --git a/Modules/CheckForPthreads.c b/Modules/CheckForPthreads.c
index e70ceb1..ea1f7ac 100644
--- a/Modules/CheckForPthreads.c
+++ b/Modules/CheckForPthreads.c
@@ -1,6 +1,6 @@
#include <pthread.h>
-void* start_routine(void* args)
+static void* start_routine(void* args)
{
return args;
}
