tests: Skip eap_tls_pkcs8_pkcs5_v15 with GnuTLS

It looks like this private key format is not supported in GnuTLS (tested
with version 3.4.10).

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/test_ap_eap.py

@@ -82,7 +82,7 @@ def check_ocsp_support(dev):
 
 def check_pkcs5_v15_support(dev):
     tls = dev.request("GET tls_library")
-    if "BoringSSL" in tls:
+    if "BoringSSL" in tls or "GnuTLS" in tls:
         raise HwsimSkip("PKCS#5 v1.5 not supported with this TLS library: " + tls)
 
 def check_ocsp_multi_support(dev):