Guard some tests by presence of strong entropy
diff --git a/tests/suites/test_suite_rsa.function b/tests/suites/test_suite_rsa.function
index bdf3db8..181eb0d 100644
--- a/tests/suites/test_suite_rsa.function
+++ b/tests/suites/test_suite_rsa.function
@@ -658,7 +658,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C */
+/* BEGIN_CASE depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C:ENTROPY_HAVE_STRONG */
 void mbedtls_rsa_gen_key( int nrbits, int exponent, int result)
 {
     mbedtls_rsa_context ctx;