CLEANUP: ssl: Remove a duplicated #include

openssl/x509.h is included twice since commit fc0421fde ("MEDIUM: ssl:
add support for SNI and wildcard certificates").

Signed-off-by: Aurélien Nephtali <aurelien.nephtali@corp.ovh.com>
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 271940a..daf4282 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -43,7 +43,6 @@
 #include <openssl/ssl.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
-#include <openssl/x509.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
 #include <openssl/hmac.h>