openssl: Disable PKCS#7/CMS when building against OpenSSL < 0.9.8g

Fixes #292.

src/libstrongswan/plugins/openssl/openssl_pkcs7.c

@@ -13,8 +13,10 @@
  * for more details.
  */
 
+#include <openssl/opensslv.h>
 #include <openssl/opensslconf.h>
 
+#if OPENSSL_VERSION_NUMBER >= 0x0090807fL
 #ifndef OPENSSL_NO_CMS
 
 #include "openssl_pkcs7.h"
@@ -788,3 +790,4 @@ pkcs7_t *openssl_pkcs7_load(container_type_t type, va_list args)
 }
 
 #endif /* OPENSSL_NO_CMS */
+#endif /* OPENSSL_VERSION_NUMBER */

src/libstrongswan/plugins/openssl/openssl_plugin.c

@@ -366,10 +366,12 @@ METHOD(plugin_t, get_features, int,
 				PLUGIN_SDEPEND(PUBKEY, KEY_DSA),
 		PLUGIN_REGISTER(CERT_DECODE, openssl_crl_load, TRUE),
 			PLUGIN_PROVIDE(CERT_DECODE, CERT_X509_CRL),
+#if OPENSSL_VERSION_NUMBER >= 0x0090807fL
 #ifndef OPENSSL_NO_CMS
 		PLUGIN_REGISTER(CONTAINER_DECODE, openssl_pkcs7_load, TRUE),
 			PLUGIN_PROVIDE(CONTAINER_DECODE, CONTAINER_PKCS7),
 #endif /* OPENSSL_NO_CMS */
+#endif /* OPENSSL_VERSION_NUMBER */
 #ifndef OPENSSL_NO_ECDH
 		/* EC DH groups */
 		PLUGIN_REGISTER(DH, openssl_ec_diffie_hellman_create),
@@ -470,4 +472,3 @@ plugin_t *openssl_plugin_create()
 
 	return &this->public.plugin;
 }
-