remove mbedtls_nist_kw_self_test from selftests

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
diff --git a/programs/test/selftest.c b/programs/test/selftest.c
index 546716f..4794cef 100644
--- a/programs/test/selftest.c
+++ b/programs/test/selftest.c
@@ -309,9 +309,6 @@
 #if defined(MBEDTLS_CCM_C) && defined(MBEDTLS_AES_C)
     { "ccm", mbedtls_ccm_self_test },
 #endif
-#if defined(MBEDTLS_NIST_KW_C) && defined(MBEDTLS_AES_C)
-    { "nist_kw", mbedtls_nist_kw_self_test },
-#endif
 #if defined(MBEDTLS_CMAC_C)
     { "cmac", mbedtls_cmac_self_test },
 #endif