charon-tkm: Use built-in plugins instead of OpenSSL

Since the encryption has been moved into the TKM we don't rely on many
cryptographic operations.  Mainly SHA-1 that's used in IKEv2 (NAT-D) and
for some internal hashes (cookies, message duplicate detection), and
certificate and public key parsing (not the actual signature/chain
verification, which is done by the TKM).

src/charon-tkm/Makefile.am

@@ -27,9 +27,12 @@ TEST_OPTS = \
 PLUGINS = \
 	kernel-netlink \
 	pem \
+	pkcs1 \
+	random \
+	sha1 \
 	socket-default \
-	openssl \
-	vici
+	vici \
+	x509
 
 all: build_charon