send-email: don't call methods on undefined values

diff --git a/thread-utils.c b/thread-utils.c
index 7f4b76a95899cc28aa1d42598d1649f126980ed9..97396a75ae4fc3f118750dd687fba85e3fc526cc 100644 (file)
--- a/thread-utils.c
+++ b/thread-utils.c
@@ -24,7 +24,7 @@ int online_cpus(void)
        long ncpus;
 #endif
 
-#ifdef _WIN32
+#ifdef GIT_WINDOWS_NATIVE
        SYSTEM_INFO info;
        GetSystemInfo(&info);