Guard decl and use of gmtime mutex by HAVE_TIME_DATE and !GMTIME_ALT
diff --git a/library/threading.c b/library/threading.c
index 9d5c4f1..1885efd 100644
--- a/library/threading.c
+++ b/library/threading.c
@@ -37,6 +37,7 @@
#include "mbedtls/threading.h"
+#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_ALT)
#if !defined(_WIN32) && (defined(unix) || \
defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
defined(__MACH__)))
@@ -53,6 +54,7 @@
#endif /* !_POSIX_VERSION || 200112L > _POSIX_THREAD_SAFE_FUNCTIONS */
#endif /* !_WIN32 && (unix || __unix || __unix__ ||
* (__APPLE__ && __MACH__)) */
+#endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_ALT */
#if defined(MBEDTLS_THREADING_PTHREAD)
static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )