Add the possibility to build without the ENGINE framework.

PR: 287

crypto/engine/enginetest.c

@@ -56,9 +56,17 @@
  *
  */
 
-#include <openssl/e_os2.h>
 #include <stdio.h>
 #include <string.h>
+
+#ifdef OPENSSL_NO_ENGINE
+int main(int argc, char *argv[])
+{
+    printf("No ENGINE support\n");
+    return(0);
+}
+#else
+#include <openssl/e_os2.h>
 #include <openssl/buffer.h>
 #include <openssl/crypto.h>
 #include <openssl/engine.h>
@@ -272,3 +280,4 @@ end:
 	CRYPTO_mem_leaks_fp(stderr);
 	return to_return;
 	}
+#endif